Term
|
Definition
Peptidoglycan-B-linked NAG/NAM; protection/strength
Teichoic Acids-glycerol Phosphate or ribitol phosphate polymer; promotes adhesion to epithelium
Lipoteichoic acids-polyglycerol phosphate; holds together PM and PG; promotes adhesion
plasma membrane |
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Term
|
Definition
Outer Membrane (lipopolysaccharide; OM proteins (porins/porin-like proteins));
peptidoglycan;
periplasmic space; plasma membrane
OM proteins involved in hydrolysis, antibiotic inactivation, adhesion, chemotaxis, transport
Outer leaflet has LPS (endotoxin)
PG in inter membrane space
Gives bug negative overall charge for evasion of complement and phagocytosis |
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Term
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Definition
In cytosol, sequential addition of amino acids to UDP-NAM to form NAM-pentapeptide. (requires ATP)
In inner leaflet, UMP is released leaving a di-P linkage; NAM pentapeptide is now attached to bactoprenol (membrane bound lipid like carrier); NAG is added to complex as well as amino acids; Complex crosses membrane; This disaccharide unit is attached to the end of the growing chain; transpeptidases crosslink adjacent glycan chains to form single NAM-NAG chain |
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Term
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Definition
Stain purple with crystal violet/iodine
Decolorization
Counterstain with Safranin (red) |
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Term
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Definition
70S (2 subunits of 50S and 30S) |
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Term
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Definition
All spores are Gram + rods
Exosporium, spore coat, cortex, core
Dipicolinic Acid is unique to spores and aids in resistance
Sterilize in autoclave 120 > 20 minutes
70% EtOH, 10% bleach, water |
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Term
|
Definition
an organelle of bacteria that appears as an invagination of the plasma membrane and functions in DNA replication and cell division |
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Term
Proinflammatory effects of PG |
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Definition
Fixes complement, drives PRR activation and TNF production |
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Term
|
Definition
an organized community of microbial cells that has a capsule/slime layer over the entire population |
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Term
|
Definition
Hydrophillic
network of polysaccharides
Called slime layer if amorphous |
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Term
|
Definition
Common or Somatic: attach to epithelial cells
Sex-only one per cell; involved in gene transfer
Composed of pilin which form a tube with a small hollow core |
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Term
|
Definition
Rotating helical structures anchored to PM for locomotion
Monotrichous (at one pole)
Lophotrichous->1 at a pole
Amphitrichous-at both poles
Peritrichous-all around the bacteria
Has basal body in which central rod rotates; hook like joint, and flagellin filament |
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Term
|
Definition
molecular mechanisms of directed movement |
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Term
General Secretory Pathway |
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Definition
Sec proteins serve as chaperones
ATP dependent
Gram +/- |
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Term
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Definition
Extends across both membranes
Proteins exported w/o use of GSP
ATP dependent
No chaperones |
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Term
|
Definition
From periplasm into ECM
ATP dependent
Only provides second step for proteins already found in periplasm using sec proteins of GSP and Tat proteins |
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Term
|
Definition
Uses GSP or Tat
Transports across outer membrane
UNIQUE: ATP INDEPENDENT
Similar to Type 2 |
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Term
|
Definition
Extends across both membranes
has syringe like apparatus
directly injects proteins across a 3rd membrane (toxins into host cells)
Utilizes a chaperone and is ATP Dependent
Notable use in Yersenia pestis (bubonic plague) |
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Term
|
Definition
Extends across both membranes
ATP dependent
Syringe like apparatus (like Type III) but can transport protein AND DNA (toxins and plasmids) |
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Term
|
Definition
waxy material in outer wall of Mycobacterium (tb and leprae) and Nocardia species
Stain with Carbol fuschin dye/destain with acid alcohol
Acid fast wall is rich in mycolic acids which resist lysozyme and leads to fastidious slow growing bacteria |
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Term
|
Definition
Mycolic acids/polypeptides in outer layer consisting of free lipids, glycolipids and peptidoglycolipids
Surface proteins are species specific
Also, cord factor, trehalose mycolates and sulfolipids, arabinogalactan, lipoarainomannan, arabinomannan and Wax D |
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Term
|
Definition
Binds CD14 to drive toxic shock sydrome, a cytokine storm of IL I and TNF-alpha that induces fever and can lead to MTOF and death
Comprised of Lipid A, core polysaccharide and O side chain; Lipd A contains glucosamine and is highly toxic; core polysacch is fairly conserved; O side chain is major surface antigen that shows most variability
LPS assembly uses bactoprenol carrier |
|
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Term
|
Definition
mechanism bacteria use to monitor own population and growth phase |
|
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Term
Highly Reactive Oxygen Species |
|
Definition
H2O2 and O2-
Bacteria use catalase and superoxide dismutase to counteract these; bacteria that lack these enzymes are likely anaerobic |
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Term
|
Definition
organization of genes associated with pathogenesis; located in genomic DNA which is fundamentally different than rest of the genome |
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Term
Mechanisms of genetic diversity |
|
Definition
Mutation
Recombination
Transposition
Genetic Exchange |
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Term
|
Definition
recombination used for this; mechanism for immune evasion and ability to change surface antigens;
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Term
|
Definition
Donor and host DNA must have large regions of sequence that are similar or identical; recipient cell must make enzymes to replace segments of DNA such as RecA |
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Term
Site Specific Recombination |
|
Definition
Used by viruses to get into host genomre; limited DNA similarity; donor enzymes recognize unique DNA sequences |
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Term
|
Definition
genetic unit that can modulate its own relocation using Transposase and the 2 elements: insertion sequences and transposons;
IS-use unzymes for site-specific recombination and have inverted repeats and direct repeats; only genes involved in transposition are encouded here
Transposons: Have more enzymes that are involved in antibiotic resistance, toxins, etc. and transposition may be replicative |
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Term
|
Definition
Transfer of genetic material from donor to recipient cell;
Uses Transformation, Transduction, or Conjugation |
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Term
|
Definition
Source of DNA is cell free. Uptake regulated by host cell and is called competence |
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Term
|
Definition
Direct interaction between 2 bacteria with transfer of a plasmid (conjugative plasmid has genes to drive own transfer; non-conjugative lack these genes);
Can occur between different species; varies between Gram +/- ; many plasmids carry virulence genes |
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Term
|
Definition
Often transfer antimicrobial resistance, pili, adhesion, and toxin genes; can be pheromone dependent |
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Term
|
Definition
F factor was first plasmid identified to modulate transfer of different chromosomal genes; Plasmid DNA is cut and a single strand passes thru Type IV secretion bridge; complimentary strands formed resulting in dsDNA plasmid in each cell; R plasmid encodes resistance genes, encode transposons that carry resistance |
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Term
|
Definition
transfer of genetic material is via a virus, a bacteriophage, and can be viral or viral/bacterial; Can be generalized or specialized; genes transferred can be toxins, virulence factors, enzymes, etc. Exogenote DNA is injected into host; Can be lytic (causes cell lysis) or lysogenic (passive replication without killing cell) |
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Term
Measurement of Anti-microbial Activity |
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Definition
Diffusion tests (Kirby Bauer and E test)
Macro dilution (test tubes)
Microdilution (plates)
Determine Min. Inhibitory comcentration or minimum bactericidal concentration |
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Term
|
Definition
Block Cell Wall synthesis
Penicillins, cephalosporins, monobactam, carbapenems
Inhibit transpeptidation and activate autocatalytic enzymes (NOTE: Gram- bacteria make B-lactamases) |
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Term
|
Definition
clavulanic acid, sulbactam, tazobactan |
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Term
|
Definition
Natural Pen G & V
Penicillinase -resistant: Oxacillin, nafcillin, cloxacillin, methicillin
Amino Penicillins: ampicillin, amoxacillin
Anti-pseudomonas: ticarcillin
Extended spectrum: pepercillin |
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Term
1st Generation Cephalosporins |
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Definition
cephalexin, cefazolin
for non-life threatening infections/surgical prophylaxis |
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Term
2nd Generation Cephalosporins |
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Definition
cefuroxime, cefoxitin
Increased activity against Gram-, more resistant to B-lactamases |
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Term
3rd generation cephalosporins |
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Definition
ceftriaxone, cefoperazone
broad spectrum; CNS penetration |
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Term
4th generation cephalosporins |
|
Definition
cefepime
broadest spectrum of activity against Gram +/- |
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Term
|
Definition
Aztreonam
Resistant to B-lactamases
Effective against Gram- but NOT Gram + |
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Term
|
Definition
imipenem, meropenem, ertapenem
resistant to most b-lactamases
used for Gram+/-
TOXIC |
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Term
|
Definition
Vancomycin, Bacitracin, others |
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Term
|
Definition
glycopeptide AB, blocks transglycosylation
Kills Gram + (especially pen-resistant Staph)
Some bacteria have Van-A for resistance |
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Term
|
Definition
Blocks dephosphorylation of bactoprenol
Kills Gram +
Administered topically |
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Term
|
Definition
Cycloserine: D-alanine analog blocks cell wall synthesis
Isoniazid: inhibits mycolic acid synthesis
Ethambutol: inhibits arabinogalactan synthesis
Ethionamide: inhibits mycolic acid synthesis |
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Term
|
Definition
Disrupt plasma membrane
Bactericidal against Gram- |
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Term
|
Definition
Cubicin
bactericidal lipopeptide depolarizes membrane
Use against Gram + cocci |
|
|
Term
Antimetabolite Antibiotics |
|
Definition
Sulfonamides (Sulfmethoxazole, dapsone): inhibits PAPA incorporation into dihydropteroic acid so inhibits folate synthesis; Bacteriostatic against Gram+/- but a lot of resistance so now used for UTI's from E.coli. Allergies common
Trimethoprim (inhibits dihydrofolate reductase)
Two are used synergistically against aerobes, Gram +/- cocci, bacilli |
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|
Term
Quinolones and Fluoroquinolones |
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Definition
Inhibit DNA gyrase and DNA synthesis
Ciprofloxacin, moxifloxicin, gatifloxicin
Bactericidal against aerobes and fac. aerobes |
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Term
|
Definition
Inhibits DNA synthesis by inhibiting RNA polymerase
rifampin, rifabutin, rifaximin
Bactericidal for Gram +/some -
Uses: mycobacterium tb, and prophylaxis for N. meningitis, and H. influenza type B |
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Term
|
Definition
metronidazole, tinidazole
Damages DNA, not an inhibitor of synthesis
Kills anaerobic bacteria, fungi, parasites
Given with B-lactam to broaden spectrum |
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Term
|
Definition
streptomycin, gentamicin, amikacin
Binds 30S, blocks initiation
uses against aerobes
TOXIC
resistance slowly develops |
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Term
|
Definition
tetracycline, doxycycline, tigercycline
Binds 30S, stops elongation
Bacteriostatic against some Gram + and Gram - rods and cocci, aerobes and anaerobes, cell wall deficient
TOXIC to bones and teeth, GI
Resistance via efflux; resistant to one, resistant to all |
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Term
|
Definition
Binds 50S, inhibits peptide bond formation
Bacteriostatic against some Gram +/-
TOXIC-aplastic anemia; bone marrow transplant needed |
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Term
|
Definition
erythromycin, azithromycin, telithromycin
Binds 50S, blocks translocation and/or inhibits peptide bond formation
Bacteriostatic against some Gram +/- and some intracellular pathogens
Resistance to one, resistance to all |
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Term
|
Definition
clindamycin
Binds 50S, inhibits peptide bond formation
Bacteriostatic against Gram+/- |
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Term
|
Definition
topical for gram + cocci
inhibits synthesis of isoleucyl-tRNA |
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Term
|
Definition
Quinupristin+Dalfopristin
FDA approved to treat vancomycin resistant E. faecium; also effective against vano-resistant staph; Binds 30S |
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Term
|
Definition
an oxazolidinone
Binds 50S site
Treats VREF, MRSA, MSSA |
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Term
Miscellaneous Antimicrobials |
|
Definition
Methenamine and Nitrofurantoin (UTI's)
Pyrazinamide (Mycobacterium) |
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Term
|
Definition
Used to reduce the number of microbes on skin surfaces
ex) alcohols, iodophors, chlorhexidine, PCMX, triclosan |
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Term
|
Definition
high level disinfectants used for items involved with invasive procedures that can't withstand sterilization
ex) glutaraldehyde, hydrogen peroxide, peracetic acid, chlorine
Intermediate level cleans surfaces without spores
ex) alcohols, iodophores
Low level for blood pressure cuffs, etc
ex) quaternary ammonium |
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Term
|
Definition
Alcohols: spores, some viruses and fungi
halogens: some spores
aldehydes: bacteriostatic at low conc
phenols: spores, some viruses
gases:
cationic detergents:
iodines: must clean off organic matter
chlorhexidine: kills slowly
hexachlorphene: only kills Gram +
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Term
|
Definition
S. epidermidis, Micrococcus sp., Corynebacterium sp.,
P. acnes |
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Term
|
Definition
yeasts, S. aureus, Lactobacillus sp. |
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Term
Nose and nasopharynx inhabitants |
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Definition
Major: S. epidermidis, Corynebacterium sp.,
Minor: S. aureus, Haemophilus sp., Streptococcus sp., Branhamella sp |
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Term
|
Definition
Major: S. mitis, S. sanguis, S. salivarius,
S. mutans (plaques and caries)
Other: S. epidermidis, peptostreptococcus sp., Lactobacillus sp, Treponema sp. Actinomyces sp. Bacteroides sp., Fusobacterium sp., Veillonella sp |
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Term
|
Definition
Same as mouth plus Corynebacterium sp. |
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Term
|
Definition
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Term
|
Definition
Corynebacterium sp., Lactobacillus sp., Enterococcus sp. |
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Term
|
Definition
Distal: Candida albicans, Enterobacteriaceae,
Gram-anaerobes |
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Term
Large intestine Natural flora |
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Definition
Strict anaerobes: Bacteroides sp., Fusobacterium sp., Eubacterium sp., Peptostreptococcus sp., Bifidobacterium sp.,
Minor: Enterococcus sp., Staphylococcus sp., Enterobacteriaceae, C. albicans |
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Term
Genitourinary Tract Normal flora |
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Definition
Urethra sterile except distal part which has flora like skin
Vagina, cervix: Lactobacillus sp., Bacteriodes sp., Corynebacterium sp., Sp. epidermidis, Enterococcus sp.
In carriers: C. albicans, T. vaginalis |
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Term
|
Definition
When the underlying pathogen is activated and re-emerges to cause disease (ex. HSV) |
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Term
|
Definition
underlying pathogen persists but without causing apparent disease (HIV) |
|
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Term
|
Definition
total number of cases in a population |
|
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Term
|
Definition
the number of new cases of a disease in a defined period of time |
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Term
|
Definition
Pili/Fimbriae: adherence; resist phagocytosis
Capsules/slime layers: resist phagocytosis; inhibit C3b deposition
Exotoxins: AB (diptheria), non-AB(pore forming LLO),
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Term
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Definition
Gram+, filamentous, fac/strict anaerobes
inhabit mucosal surfaces
Infection: pyogenic abscesses connected by sinus tracts; "sulfur granules" form in tissues; opp. infections; cervicofacial infections most common (assoc w poor oral hygiene or trauma)
Control: penicillin, tetracycline, macrolide |
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Term
|
Definition
Gram+, filamentous, partially acid fast, aerobic, fragment, common in soil
Infections: survive/replicate in macrophages; cause exogenous bronchopulmonary infections in immunocompromised that disseminates to CNS; also cause primary cutaneous and lymphocutaneous infections and brain abscess
Control: TMP-SMX, 3rd gen ceph. |
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Term
Peptostreptococcus/Streptococcus |
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Definition
Gram+ cocci, anaerobes, non-spore forming, no cytochromes; predisposing conditions, proinflammatory cell walls
Infections: brain abscess, pulmonary infection, intra-abdominal infection, female pelvic inf, skin and soft tissue infections
Control: penicillin, clindamycin, imipenem |
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Term
|
Definition
Gram-rods, anaerobes, non-spore forming, lack cytochromes
60% of intra-abdominal infections and 70% of anaerobic bacteremias
enterotoxin
Infections: brain, oral, URT, dental, sinuses, LRT, female genital tract inf.,
Control: drain, debride, metronidazole, clindamycin, chloramphenicol, imipenem |
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Term
Prevotella, Porphromonas, Fusobacterium |
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Definition
Gram-rods, anaerobes, non-spore forming, lack cytochromes
capsule, adhesins, enzymes=virulence factors
Infections: brain, oral, URT, dental, sinuses, LRT, female genital tract inf.,
Control: drain, debride, metronidazole, clindamycin, chloramphenicol, imipenem |
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Term
|
Definition
Gram+ rods, anaerobes, non-spore forming, lack cytochromes
Infections: associated with acne
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Term
|
Definition
gram+ rods, endospore-formers, common soil inhabitants, facultative anaerobes, catalase + |
|
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Term
|
Definition
Non-motile, Gram+rods, endospores, fac anaerobes, catalase +
Virulence factors: zoonosis, polyglutamic acid capsule; toxins(PA-EF (calmodulin-dep adenylate cyclase to increase intracellular cAMP), PA-LF(protease that induces apoptosis/disrupts endothelial barrier
Infections: Sx associated with toxin/route of entry; intestinal, inhalation, cutaneous all assoc w/ toxemia
Control: Vaccine, penicillin, oxycycline, quinolone |
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Term
|
Definition
Gram+rods, endospores, fac anaerobes, catalase+, motile
Virulence factors: Heat labile (HL) and heat stable(HS) enterotoxins, cereolysin, lectithinase
Infections: emetic (HS toxin) and diarrheal (HL toxin) diseases (food borne); other: bacteremia, pneumonia, ophthalmitis, osteomyelitis
Control: proper food storage, supportive care, serious infections use Vancomycin or clindamycin |
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Term
|
Definition
Gram+rods, spores, fac anaerobes, catalase +
emetic gastroenteritis, sepsis |
|
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Term
|
Definition
Gram +rods, spores, fac anaerobes, catalase+
diarrheal gastroenteritis |
|
|
Term
Bordetella pertussis and B. parapertussis |
|
Definition
Gram-coccobacilli, aerobe, capsule, pili
Virulence factors: human reservoir, aerosol transmission, LPS, capsule, sol PG, pertussis toxin, invasive adenylate cyclase, adhesins (pertactin, filamentous hemagglutinin, pili, pertussis toxin, type 3 secretion
Infections: pertussis in children, persistent cough in adults
Control: vaccine, macrolide |
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Term
|
Definition
Motile, microaerophilic, Gram-spirochete, no LPS, pro-inflammatory lipoprotein in OM, changes antigenic strux, zoonotic diseases, difficult to culture |
|
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Term
|
Definition
Motile, microaerophilic, Gram-spirochete, no LPS, pro-inflammatory lipoprotein in OM, changes antigenic strux, zoonotic diseases, difficult to culture
lice vector, humans only host
Virulence: highly invasive, intracellular growth
Infections: relapsing fever
Control: avoid vectors, tetracyclines, macrolides |
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Term
|
Definition
Motile, microaerophilic, Gram-spirochete, no LPS, pro-inflammatory lipoprotein in OM, changes antigenic strux, zoonotic diseases, difficult to culture
tick vector, rodents, small mammals are natural hosts
Virulence: highly invasive, intracellular growth
Infections: relapsing fever
Control: avoid vectors, tetracyclines, macrolides |
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Term
|
Definition
Motile, microaerophilic, Gram-spirochete, no LPS, pro-inflammatory lipoprotein in OM, changes antigenic strux, zoonotic diseases, difficult to culture
Virulence: highly invasive, tick vector, mice, deer, & birds are resevoir; adhesins,
Infections: Lyme disease (early localized-erythema chronicum migrans); (early disseminated-secondary skin lesions, facial nerve palsy, meningitis, carditis); late disease (arthritis)
Control: avoid vectors; vaccine, doxycycline, amoxicillin, cefuroxime, cetriaxomne for serious infection |
|
|
Term
Brucella melitensis (biovars or species melitensis, abortus, suis, canis) |
|
Definition
Gram-, non-motile coccobacilli, aerobe, catalase +, oxidase +, urease+
Virulence factors: animal resevoir,, transmit by direct contact or ingestion; LPS, fac. intracellular pathogen
Infections: brucellosis, sepsis, granulomas or abscesses in reticuloendothelial tissue (LN, bone marrow, spleen, liver)
Control: doxycycline+rifampin |
|
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Term
|
Definition
Gram-, curved bacilli, microaerophilic, motile at 37C, oxidase and catalase+ |
|
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Term
|
Definition
Gram-, curved bacilli, microaerophilic, motile at 37C, oxidase and catalase+
grows at 25C but not 42C
Virulence factors: zoonotic with many animal reservoirs, transmit by direct contact, food, water; LPS, capsule (S protein that inhibits C3b binding)
Infections: common in immune compromised , sepsis following gastroenteritis
Control: avoid undercooked food/contaminated water, tetracyclines, macrolides, quinolones |
|
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Term
|
Definition
Gram-, curved bacilli, microaerophilic, motile at 37C, oxidase and catalase+
Grows at 42 NOT 25C
Virulence factors: many animal reservoirs (esp food animals), transmit by contaminated food/water; LPS, invasive, enterotoxin?,, cytotoxin?
Infections: leading cause of bacterial food-borne gastroenteritis (inflammatory), disseminated disease in immunocompromised; secondary complication with GBS and arthritis
Control: avoid undercooked food or contaminated water tetracyclines, macrolides, quinolones |
|
|
Term
genera Chlamydia and Chlamydophila |
|
Definition
strict intracellular bacteria, 2 form-life cycle: elementary bodies(infectious form) and reticulate bodies (replicative form); Gram- like envelope w/o PG |
|
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Term
|
Definition
strict intracellular bacteria, 2 form-life cycle: elementary bodies(infectious form) and reticulate bodies (replicative form); Gram- like envelope w/o PG
Virulence: intracellular pathogen, human reservoir, transmission route depends on dyndrome
Infections: Trachoma (seros A, B, Ba, C; transmitted by direct contact or flies, keratitis); inclusion conjunctivitis (seros B,Ba,D-K; transmitted by direct contact), STD (seros B,Ba,D-K; urethritis, cervicitis; PID, epididymitis, prostatitis), lymphogranuloma venereum (seros L1-3, STD)
Control: doxycycline or macrolides |
|
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Term
|
Definition
strict intracellular bacteria, 2 form-life cycle: elementary bodies(infectious form) and reticulate bodies (replicative form); Gram- like envelope w/o PG
Virulence: intracellular pathogen, bird reservoir, transmit by bite or inhalation
Infections: atypical pneumonia
Control: tetracyclines |
|
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Term
|
Definition
strict intracellular bacteria, 2 form-life cycle: elementary bodies(infectious form) and reticulate bodies (replicative form); Gram- like envelope w/o PG
Virulence: intracellular pathogen, human reservoir, transmit by aerosols
Infections: (long incubation pd) pneumonia, bronchitis, sinusitis, pharyngitis, atherosclerosis
Control: tetracyclines or macrolides |
|
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Term
|
Definition
Gram+rods, strict anaerobes, spores, soil and GIT inhabitant
histotoxic, aerotolerant and non-motile, 5 strains based on exotoxin profile (A-E); target hemolysis associated with alpha and theta toxins
Virulence: exotoxins, alpha (most impt) and beta toxin (enteritis necroticans); enterotoxin Superantigen, heat labile; infection initiated by traumatic entry of endospores or inoculation of ischemic tissue or consumption of contaminated food (gastroenteritis)
Infections: most assoc with A; sepsis, intra-abdominal, biliary tract, genital, pleuropulmonary, cellulits, fascitis, myonecrosis, gastroenteritis (food poisoning from A), enteritis necroticans (C strain)
Control: debridement + penicillin, clindamycin or metronidazole |
|
|
Term
Other histotoxic Clostridia |
|
Definition
C. septicum (myonecrosis, neutropenic colitis)
C. novyi, Csordellii, C. histolyticum (myonecrosis)
C. difficile |
|
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Term
|
Definition
Gram+rods, strict anaerobes, spores, soil inhabitant;
Virulence: human reservoir, survival of spores in hospitals, adhesins, enterotoxin (toxin A); cytotoxin (toxin B)
Infections: self limiting diarrhea, pseudomembranous enterocolitis (antibiotic assoc/non-assoc)
Control: Vancomycin or metronidazole |
|
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Term
|
Definition
Gram+rods, strict anaerobes, spores, soil inhabitant
very oxygen sensitive, motile
Virulence: traumatic entry of endospores, tetanolysin (hemolysin), tetanospasmin (neurotoxin)
Infections: tetanus (spastic paralysis); generalized, localized, cephalic, neonatal
Control: vaccine, would management, TIG, Td, penicillin or metronidazole |
|
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Term
|
Definition
Gram+rods, strict anaerobes, spores, soil inhabitant
motile, very resistant endospores
Virulence: strain classification: group 1 (proteolytic, neurotoxins A,B, or F), group II (non-proteolytic, toxins B,E, or F)
Infections: food, wound, infant botulism
Control: anti-toxin (A,B,E), penicillin or metronidazole |
|
|
Term
Corynebacterium diphtheriae |
|
Definition
Gram+pleomorphic bacillus, aerobe, black colonies on tellurite agar
Virulence: human reservoir, transmit by respiratory droplets; diphtheria toxin (ADP-ribosylates EF2 and inhibits protein synthesis)
Infections: signs and symptoms related to toxin (myocarditis, neuritis); cutaneous and pharyngeal
Control: vaccine (DPT, Tdap); anti-toxin (only from CDC) + penicillin, macrolide, or tetracycline |
|
|
Term
family Enterobacteriaceae |
|
Definition
enteric bacteria; >25 genera; Gram- bacilli; oxidase -, facultative anaerobes; common inhabitants of GIT; serological typing based on O-polysacch antigens of LPS, K (capsular) antigens, and H (flagellar) antigens |
|
|
Term
|
Definition
enterobacter; lactose fermented
Virulence: animal and human reservoir; transmit by contaminated food/water, direct contact, fecal-oral; adhesins, type III secretion, quorum sensing, cytotoxins, LPS, enterotoxins, capsule/biofilm
Infections: GIT/non-GIT
Control: avoid contaminated food/water/animals; symptomatic, TMP-SMX, quinolone, azithromycin or rifaxmin (no antibiotics for EHEC) |
|
|
Term
E. Coli non-GIT infections and control |
|
Definition
UTI (adhesins, cytotoxin, LPS; TMP-SMX, floroquinolone, azithromycin
Pneumonia (LPS; 3rd gen ceph.+aminoglycoside)
Sepsis (LPS; 3rd gen ceph+aminoglycoside)
Meningitis (neonatal; LPS, K1 strains; 3rd gen ceph+aminoglycoside) |
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Term
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Definition
EPEC (bundle-forming pili, type 3 secretion, intimin-mediated attachment; loss of microvilli in sm intestine/ absorption inhibited; infant diarrhea)
ETEC (adhere to sm intestine via pili, secret HL toxin +/or HS enterotoxins; fluid and electrolyte loss; traveler's diarrhea)
EIEC (attaches and invades lg intestine; absorption inhibited; inflammatory diarrhea that is watery to bloody; adult infection)
EHEC (adheres to lg intestine epithelial cells via pili; spreads cell to cell via actin tails; secrete Shiga-like toxins I & II; absorption inhibited; watery diarrhea; O157:H7 & SLT-II causes hemolytic uremic syndrome)
EAggEC/EAEC (adheres in stacked-brick pattern known as the aggregative adherence, non-inflam diarrhea) |
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Term
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Definition
Enterobacter; non-motile; capsule
Virulence: animal reservoir; transmit by aerosol; LPS, capsule
Infections: lobar pneumonia; UTI, sepsis, meningitis
Control: 3rd gen ceph+aminoglycoside
Other species: K. Oxytoca, pneumoniae spp ozaenae, pneumoniae spp rhinoscleromatis |
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Term
Proteus mirabilis and P. vulgaris |
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Definition
Enterobacter; swarming motility; urease pos, H2S produced
Virulence: animal reservoir; transmit by direct contact; LPS, motility, urease
Infections: UTI, stones (in compromised: pneumonia and sepsis)
Control: 3rd gen ceph + aminoglycoside for life-threatening infections; quinolone, ampicillin, or amoxicillin for UTI |
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Term
Shigella sonnei
other species: S. dysenteriae, flexneri, boydii) |
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Definition
enterobacter; non-motile, no lactose fermentation, no H2S produced
Virulence: human reservoir; transmit by direct contact, perrson-to-person, food or water; adherence, LPS, type III secretion, intracellular growth; Shiga toxin actin tails mediate cell to cell spread
Infections: inflammatory diarrhea that is watery or classic dysentery
Control: avoid contaminated food/water; quinolone, TMP-SMX, or rifaximin |
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Term
Salmonella enterica
(serotypes choleraesuis, paratyphi, enteritidis, typhimurium, newport, heidelberg) |
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Definition
enterobacter; motile, no lactose ferm; produces H2S;
Virulence: human (typhi and paratyphi) and numerous animal reservoirs; transmit by direct contact, person to person, food or water; adherence, LPS, type III secretion; intracellular growth, actin rearrangement
Infections: typhoid fever, inflammatory diarrhea that is watery and mucoid; sepsis
Control: vaccine for typoid fever; avoid contaminated food/water; quinolone or TMP-SMX for GIT, ceftriaxone or chloramphemicol for sepsi |
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Term
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Definition
Enterobacter, Serratia, Citrobacter
Infections: nosocomial UTI & sepsis in immunocompromised
Increased AB resistance from R-plasmid spread within whole family |
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Term
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Definition
Gram-, pleomorphic coccobacillus, aerobe, catalase +, oxidase-, requires cysteine for growth, capsule
Virulence: many animal reservoirs (esp rabbits); transmit via ticks, biting flies, direct, ingestion, or inhalation; LPS, capsule, fac. intracellular pathogen; very infectious
Infections: (zoonosis) ulceroglandular, glandular, oculoglandular, pharyngeal, typhoidal, pneumonic
Control: avoid infected animals; doxycycline, quinolone or gentamicin |
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Term
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Definition
Gram- coccobacilli, fac anaerobe, catalase +
requires hematin (X factor) & NAD or NADP (V factor) for growth, capsule (a-f)
Virulence: human reservoir, aerosol transmission; LOS, capsule, OM proteins (adherence, invasion, intracellular growth), sol PG, IgA peptidase
Infections: pharyngitis, sinusitis, pneumonia, bronchitis, otitis media, conjunctivitis, epiglottis, sepsis, meningitis (rare w/ vaccine)
Control: vaccine; cefuroxime, ceftriaxone, amox for non-life threatening; rifampin prophylaxis |
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Term
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Definition
non-typable/unencapsulated H. influenzae (assoc with otitis media, pneumonia, sinusitis, neonatal & post partum sepsis; treat with macrolide, TMP-SMX, quinolone)
H. aphrophilus (assoc w endocarditis; treat w macrolide or quinolone)
H. ducreyi (STD; chancroid, treat w macrolide) |
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Term
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Definition
Gram- spiral rod, microaerophilic, motile at 37C, urease, oxidase and catalase+
Virulence: human reservoir; transmit via fecal/oral or direct contact; LPS, urease, acid inhibitory protein, motility, mucinase, cytotoxin, adhesins (hemagglutin, sialic acid-binding protein, Lewis blood group adhesin)
Infections: chronic gastritis leading to peptic ulcers; predisposes to carcinoma
Control: macrolide or tetracycline+metronidazole+ bismuth subsalicylate+proton pump inhibitor |
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Term
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Definition
Characteristics: gram neg rod, aerobe, catalase pos, oxidase neg, hydrolyzes hippurate, motile, fastidious
(requires high cysteine and iron levels), facultative psychro-thermophile
Virulence factors: aquatic environment the natural reservoir (parasitizes amoebas and ciliated
protozoans); transmission by aerosols (point-source); LPS (OM blebs), type II & IV secretion,
intracellular growth (internalized by coiling phagocytosis), pili, Th1 response needed
Infections: Pontiac fever (high attack rate, self limiting febrile disease), Legionnaires’ disease (low
attack rate, predisposing condition, bronchopneumonia with dry cough that becomes productive; GIT,
CNS, and kidneys may be involved)
Control: macrolide, quinolone, or doxycycline
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Term
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Definition
Characteristics: gram-negative tightly coiled spirochete, hook shaped at one or both ends; motile, aerobe
Virulence factors: many animals are reservoirs; usually transmitted to humans by direct contact with
contaminated water; LPS, invasive, intracellular growth
Infections: anicteric leptospirosis (mild syndrome to systemic disease involving aseptic meningitis);
icteric leptospirosis (Weil’s disease) with liver and kidney failure and vascular collapse
Control: macrolide, doxycycline, or ceftriaxone
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Term
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Definition
Characteristics: gram + bacillus, fac anaerobe, catalase pos, oxidase neg, fac psychrophile, hydrolyzes esculin, motile at room temp
Virulence factors: zoonotic, widespread in nature, many foods contaminated; transmitted by ingestion,
transplacental (in utero), vaginal; facultative intracellular pathogen (Th1 needed to recover),
lysteriolysin, internalin, actin tails, Act A
Infections: pregnancy (sepsis, infection of fetus), neonatal (early and late onset diseases), adults
(meningitis and sepsis most important; also gastroenteritis)
Control: avoid processed meats; sulfameth-trimeth prophylaxis; treat with beta-lactam or betalactam+
aminoglycoside
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Term
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Definition
Pasteurella multocida
Characteristics: gram neg coccobacilli, facultative anaerobe, catalase pos, oxidase pos, encapsulated
Virulence factors: found in the mouth of domestic animals (cats); transmission by bite; LPS, capsule
Infections: cellulitis, sepsis
Control: penicillin, tetracycline, or amoxicillin/clavulanic acid
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Term
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Definition
Characteristics: gram neg diplococcus, aerobe, oxidase pos, catalase pos, grows on most media (not
fastidious)
Virulence factors: human reservoir (5-50% colonization); aerosol transmission; LOS (no somatic Opolysacch),
adhesins (pili and OM proteins),
Infections: important cause of otitis media, sinusitis, bronchitis, pneumonia
Control: cefaclor, marcrolides, quinolones, trimeth-sulfameth
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Term
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Definition
Characteristics: gram neg rod
Infections: cat scratch disease; bacillary angiomatosis in immunocompromised
Control: rifampin, quinolone, or azithromycin
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Term
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Definition
(gram-positive cytology with high glycolipid [mycolic acids,
arabinogalactan, lipoarabinomannan] content in cell wall responsible for acid-fast staining,
proinflammatory activities, and resistance to detergents and disinfectants; most slow growing and form
serpentine cords; aerobic)
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Term
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Definition
Characteristics: produces niacin
Virulence factors: human reservoir; aerosol transmission (prolonged contact needed); facultative
intracellular pathogen (Th1 needed to control infection but also responsible for tissue damage); wall
gycolipids promote resistance to intracellular killing, inhibit interferon-activation of macrophages,
grows in the cytoplasm, and stimulate cell-mediated inflammatory injury
Infections: Primary TB (first exposure), Secondary TB (reactivation), Progressive primary and
secondary TB, and Miliary TB (disseminated disease involving the bone marrow, nodes, CNS, etc);
infection converts to PPD+
Control: vaccine (limited use in USA); rifampin, isoniazid, pyrazinamide, ethambutol first-line drugs
NOTE:
M. bovis causes similar disease. It doesn’t produce niacin and many animals serve as reservoirs;
transmission by ingestion.
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Term
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Definition
Characteristics: intracellular bacterium (no growth on lab media)
Virulence factors: human and armadillo reservoirs; transmission by nasal secretions; intracellular
pathogen (Th1 needed but also mediates tissue damage), proinflammatory wall, phenolic glycolipid
capsule, phenolase
Infections: Hansen’s disease (leprosy): chronic disease of skin, peripheral nerves, & URT; tuberculoid
(paucibacillary), borderline, lepromatous (multibacillary); infection converts to lepromin+
Control: dapsone + rifampin
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Term
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Definition
M. kansasii, M. marinum, M. scrofulaceum, M. ulcerans, M. fortuitum, M. avium, intracellulare
many reservoirs (soil, water, etc); localized to disseminated infections (
cause disseminated disease in AIDS) treatment depends on species
M. avium, intracellulare
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Term
genera Mycoplasma and Ureaplasma |
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Definition
(no cell wall results in pleomorphic morphology; have
sterols in plasma membrane and require exogenous sterols for growth; smallest free-living procaryotes;
all extracellular pathogens; membrane induces inflammation)
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Term
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Definition
Characteristics: prefers anaerobic growth
Virulence factors: human reservoir; transmission by direct contact
Infections: urethritis (prominent cause of NGU in men and women), cervicitis, and PID
Control: doxycycline or quinolone
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Term
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Definition
Characteristics: aerobic
Virulence factors: human reservoir; transmission by aerosols; adheres to cilitated epithelial cells (kills
them with cytotoxic membrane and H
2O2), induces cytokines (IL-1, 6 & TNF) and inflammatory infiltrate
Infections: pneumonia, tracheobronchitis, pharyngitis, otitis, Stevens-Johnson syndrome
Control: doxycycline or azithromycin
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Term
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Definition
(gram-negative, oxidase-positive diplococci; fastidious, requires extra CO
2;
poor survival on environmental surfaces; human reservoir; high turnover of envelope components (LOS
and PG) during growth)
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Term
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Definition
Virulence factors: aerosol transmission; LOS (blebs, no somatic O-polysacch), capsule (12 serogroups
with B, C, and Y most common; A associated with epidemics), adhesins (OM proteins & pili), sol PG,
IgA peptidase
Infections: sepsis, meningitis, Waterhouse-Friderichsen syndrome
Control: Vaccine; penicillin, chloramphenicol, or ceftriaxone
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Term
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Definition
Virulence factors: sexual transmission (neonatal infection in utero or during birth); LOS (blebs, no
somatic O-polysacch), adhesins (OM proteins [Por mediates complement resistance and intracellular
survival, Opa associated with attachment] pili [pili antiphagocytic]), sol PG, beta-lactamase, IgA
peptidase
Infections: urethritis in men, urethritis and cervicitis in women (~30% symptomatic); PID, disseminated
gonococcal infection (arthritis w/ or w/o skin lesions), gonococcal opthalmia
Control: ceftriaxone or cefixime + doxycycline or azithromycin if
Chlamydia
infection suspected
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Term
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Definition
Characteristics: gram negative rod, aerobic (anaerobic with nitrate), motile, oxidase & catalase pos, nonfermenter,
wide temp range, nutritionally versatile, fluorescein pigment (pyocyanin) produced by most
Virulence factors: many environmental reservoirs (including hospitals); transmission by direct contact,
food, water; LPS, pili, capsule or biofilm, proteases, cytotoxin, heat stable and labile hemolysins,
exotoxin A, exoenzyme (exotoxin) S, Type III secretion, quorum sensing, antibiotic resistance
Infections: mostly opportunistic and nosocomial; endocarditis, respiratory tract infections, pneumonia in
cystic fibrosis, sepsis (ecthyma gangrenosum), meningitis, otitis, keratitis, bone and joint infections,
UTI, skin (burn infections, generalized folliculitis)
Control: aminoglycoside + anti-Pseudomonas beta-lactam
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Term
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Definition
Infections: (colonizes many moist environments) nosocomial pneumonia, sepsis, and soft tissue
infections
Control: a carbapenem or ampicillin-sulbactam (resistance is an issue)
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Term
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Definition
Infections: RT infections in cystic fibrosis, catheter-associated UTI & sepsis
Control: trimeth-sulfmeth
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Term
Stenotrophomonas maltophilia |
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Definition
Infections: nosocomial sepsis, meningitis, UTI, wound infections
Control: trimeth-sulfmeth
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Term
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Definition
Characteristics: gram neg coccobacilli, strict intracellular pathogen, grows in cytoplasm of host cells,
utilizes host ATP, NAD, and intermediates
Virulence factors: animal reservoir; transmission by hard ticks (wood or dog; tick progeny infected);
strict intracellular pathogen, weak endotoxin, phospholipase A destroys host membranes, actin tails
mediate cell to cell spread
Infections: RMSF (vasculitis, rash)
Control: avoid tick contact; doxycycline or chloramphenicol
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Term
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Definition
louse borne or epidemic typhus; human louse transmission/ rash |
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Term
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Definition
Characteristics: gram negative cytology, no peptidoglycan or LPS, intracellular pathogen (grows in
phagosome=morula), life cycle involves reticulate and elementary - like bodies
Virulence factors: animal reservoir; transmission by tick; strict intracellular pathogen of monocytes;
immune response (gamma-interferon and activation of macrophages) associated with pathology
Infections: human monocytic ehrlichiosis
Control: avoid tick contact; doxycycline
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Term
Anaplasma phagocytophilum |
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Definition
Characteristics: similar to Ehrlichia
Virulence factors: animal reservoir; transmission by tick; strict intracellular pathogen of myeloid
precursors (neutrophils); pathogenesis related to immune response
Infections: human granulocytic anaplasmosis (formerly human granulocytic ehrlichiosis)
Control: avoid tick contact; doxycycline
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Term
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Definition
Characteristics: gram negative pleomorphic bacillus that produces resistant endospore-like structures;
obligate intracellular pathogen
Virulence factors: animal reservoir; transmission by tick to animals, to humans by inhalation or
ingestion; strict intracellular pathogen of reticuloendothelial cells; antigenic variation of LPS during
infection
Infections: Q-fever (acute febrile disease, atypical pneumonia most common; chronic with subacute
endocarditis, hepatitis, CNS, and/or pulmonary involvement)
Control: doxycycline
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Term
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Definition
(gram-positive cocci that grow in clusters; facultative anaerobes,
catalase positive, salt-tolerant)
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Term
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Definition
Characteristics: coagulase positive, ferments mannitol
Virulence factors: human reservoir (carriers); transmission by direct contact; capsule and biofilm,
quorum sensing; alpha, beta, delta, gamma-toxins; leukocidin (panton-Valentine); enterotoxins (super
antigens), pyrogenic exotoxins (TSST-1), exfoliatins (super antigens), facultative intracellular parasite,
proinflammatory cell wall components (induces IL1, TNF alpha), beta-lactamases, cell wall-bound
adhesion molecules (fibrinogen, collagen, & fibronectin-binding proteins), Protein A, extracellular
hydrolases
Infections: folliculitis, furuncle, carbuncle, cellulitis, impetigo, scalded skin syndrome, sepsis,
endocarditis, pneumonia, osteomyelitis, septic arthritis, purulent meningitis, food poisoning, toxic shock
Control: hand washing; mupirocin, clindamycin for MRSA, beta-lactam (e.g. oxacillin, nafcillin) w/ or
w/o aminoglycoside, or vancomycin;
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Term
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Definition
Characteristics: coagulase negative
Virulence factors: human reservoir, commensal and pathogenic strains; transmission by direct contact;
biofilm, quorum sensing, proinflammatory cell wall components (induces IL1, TNF alpha), alpha and
delta toxins, beta-lactamases
Infections: neonatal bacteremia, nosocomial bacteremia, prosthetic devise infection, surgical infections,
infections associated with peritoneal dialysis, urinary tract infection
Control: hand washing; beta-lactams, vancomycin+rifampin or gentamicin
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Term
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Definition
Characteristics: resistant to novobiocin, coagulase negative
Virulence factors: human reservoir; transmission by direct contact; specific adherence to urinary tract
epithelial cells; proinflammatory cell wall components
Infections: community-acquired UTI (mostly women)
Control: trimeth-sulfmeth, quinolone, amox+clavulanic acid
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Term
genus Streptococcus and Enterococcus |
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Definition
(gram-positive cocci occurring in pairs and/or chains;
facultative anaerobes; ferment lactic acid; catalase negative; alpha, beta, or gamma-hemolysis)
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Term
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Definition
Characteristics: grows in chains, Group A carbohydrate, beta-hemolytic, sensitive to bacitracin
Virulence factors: human reservoir; transmission by aerosols, food, water and direct contact;
M-proteins, fimbriae, proinflammatory cell wall components, hyaluronic acid capsule, Streptolysin O &
S, Streptococcal pyrogenic exotoxins (super antigens), intracellular invasion, adhesins (LTA, Protein F,
fibrinogen binding protein, collagen binding protein, plasmin binding protein), C5a peptidase
Infections: pharyngitis, scarlet fever, streptococcal toxic shock syndrome, impetigo, cellulitis, erysipela,
necrotizing fasciitis, puerperal sepsis, rheumatic fever (antigenic mimicry), postinfectious
glomerulonephritis
Control: penicillin, macrolide, penicillin+clindamycin for invasive disease
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Term
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Definition
Characteristics: grows in chains, Group B carb, weakly beta-hemolytic or gamma hemolytic, hydrolyzes
hippurate, posituve CAMP test
Virulence factors: human reservoir; transmitted by direct contact, person to person, transplacental;
proinflammatory wall components, capsule, intracellular invasion, C5a peptidase
Infections: neonatal infections (early and late onset); adult infections (sepsis, meningitis, respiratory and
urinary tracts)
Control: hand washing, hospital control policies; penicillin, vancomycin, penicillin or
ampicillin+aminoglycoside
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Term
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Definition
S. mutans, mitis, sanguis
, bovis groups
Characteristics: alpha or gamma hemolytic; most lack group antigen
Virulence factors: proinflammatory wall components, adhesins
Infections: inhabit oral cavity & tooth surfaces; most infections endogenous; associated with dental
caries (
S. mutans) and endocarditis
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Term
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Definition
Characteristics: Group D carb
Virulence factors: animal reservoir or endogenous source (GIT); transmitted by contaminated food or
water; proinflammatory wall components
Infections: endocarditis, bacteremia (assoc. with GI malignancy)
Control: penicillin
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Term
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Definition
Characteristics: grows in pairs, optochin sensitive, large capsule
Virulence factors: human reservoir; transmitted by aerosols or endogenous; capsule, proinflammatory
wall components, adhesins (capsule, choline-binding protein, neuraminidase), pneumococcal surface
protein A & C, autolysin, pneomolysin O, hyaluronate lyase, antibiotic resistance
Infections: pneumonia, otitis media, meningitis, sinusitis
Control: Vaccines (adult & child); CAP: macrolide, quinolone (e.g. gemifloxacin, moxafloxacin),
ceftriaxone, cefotaxime; OM, sinusitis: amox+clav; Invasive disease: vanco+ceftriaxone or cefotaxime
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Term
Enterococcus faecalis and faecium |
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Definition
Characteristics: grows in chains, Group D carbohydrate, hydrolyze esculin, tolerates high salt and bile
concentrations
Virulence factors: endogenous (GIT & vagina) or nosocomial source; transmitted by direct contact or
person to person; proinflammatory wall components, adhesins, cytolysin (bacteriocin), antibiotic
resistance
Infections: catheter-associated UTI, sepsis, endocarditis
Control: hand washing, vancomycin, vanco + aminoglyside, quinupristin/dalfopristin, linezolid,
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Term
Treponema pallidum (ssp pallidum) |
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Definition
Characteristics: thin gram negative spirochete (special microscopy needed to observe), microaerophilic,
motile, no growth on lab media, cardiolipin in OM
Virulence factors: human reservoir; sexual transmission; highly invasive, intracellular growth,
hyaluronidase, OM proteins associated with adherence, fibronectin coats outer membrane (antiphagocytic);
tissue damage associated with immune/inflammatory response
Infections: Syphilis (primary, secondary, latent, tertiary, congenital)
Control: penicillin or doxycycline
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Term
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Definition
(curved gram-negative bacilli, inhabit marine environments, motile by single
polar flagellum, facultative anaerobes, oxidase positive)
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Term
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Definition
Characteristics: killed by stomach acid; only seotypes O1 and O139 are associated with cholera
Virulence factors: transmission by food or water; pili, cholera toxin (increases intracellular cAMP)
Infections: noninflammatory watery diarrhea (potentially life threatening)
Control: avoid contaminated food/water; tetracycline or erythromycin; rehydration
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Term
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Definition
Characteristics: halophilic
Virulence factors: transmission by food or water; LPS, pili, cytotoxin/hemolysin (has enterotoxin
activity)
Infections: noninflammatory watery diarrhea to inflammatory dysentery-like gastroenteritis
Control: avoid raw or undercooked seafood; doxycycline or ciprofloxacin
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Term
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Definition
Characteristics: halophilic
Virulence factors: transmission by food or water; LPS, pili, proteases, cytotoxin, antiphagocytic capsule
(resistance to complement)
Infections: wound infections (rapidly progressive cellulitis), invasive gastroenteritis, sepsis
Control: avoid raw or undercooked seafood; doxycycline or ciprofloxacin
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Term
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Definition
(zoonotic, gram negative coccobacilli, facultative anaerobes; common virulence
factors: LPS, facultative intracellular parasite, type III secretion, yadA gene products (adhesins and antiphagocytic proteins), yop/lcr gene products (OM proteins, toxic secreted proteins), V and W antigens
(intracellular growth))
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Term
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Definition
Characteristics: bipolar staining, capsule (fraction 1 antigen)
Virulence factors: animal reservoir; transmission by flea bite or aerosols; antiphagocytic capsule
(fraction 1 Ag)
Infections: bubonic, pneumonic, septicemic plague
Control: vaccine; gentamycin or doxycycline
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