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Bacteria
Bacteria for test 1
42
Microbiology
Professional
01/20/2011

Additional Microbiology Flashcards

 


 

Cards

Term
Streptococcus pyogenes
Definition

Bio: Gram (+); Catalase (-); B-hemolytic;bacitracin sensitive

Virulence: M protein; Streptolysins S and O; Pyrogenic exotoxins (superantigen); streptokinase; Lipoteichoic acid

 

Pathology:  Spread by respiratory droplets (upper resp); Pharyngitis; Scarlet fever rash; Skin infection (pus forming); Lymph enlargement; toxic shock syndrome; Rheumetic fever; glomerulonephritis; necrotizing fascilitis

Treatment: Penicillin; allergic alternatives are cephalosporin or vancomycin

Term
Streptococcus pneumonia
Definition

Bio: Gram (+); Catalase (-); Diplococci (lancet shaped) chain; Facultative anaerobe; a-hemolytic; optichan sensitive; bile soluble

Virulence: Polysacch. capsule (Quellung reaction for ID); IgA protease

Pathology: most common pneumonia; colonize oropharyngeal; meningitis; asplenia patients at higher risk;

Treatment: Penicillin; amoxicillin/vancomycin for resistant strains; vaccine for children + asplenic patients

Term
Staphylococcus aureus
Definition

Bio: Gram (+), cluster cocci; Catalase (+); Coagulase (+); facultative anaerobe; B-hemolytic; gold pigment

Virulence: capsule; Protein A; Coagulase; Hemolysins; Leukocidin; Penicillinase; Lipases; Fibrinolysin; Exfolatin; Enterotoxins; Toxic Shock (superantigen)

Pathology: Gastroenteritis; N&V; non-bloody Diarrhea; Toxic Shock Synd; Scalded skin (peeling baby); Pneumonia; Acute Endocarditis; Osteomyelitis; septic arthritis

Treatment: Oxacillin; vancomycin

Term
Staphylococcus epidermis
Definition

Bio: Gram (+), cluster cocci; Catalase (+); Coagulase (-); facultative anaerobe

Virulence: Biofilm

Path: Bacteremia; Endocarditis; Wound infection from catheters/surgery/mechanical prosthesis; UTI; normal outer skin flora

Treatment: Vancomycin

Term
Clostridium botulinum
Definition

Bio: Gram (+); Endospore (honey/soil); Rod; Obligate Anaerobe;

Virulence: heat-labile A-B neurotoxin inhibiting ACh release at NMJ; motile flagella

Path: Foodborne- cranial nerve palsy, resp. paralysis, flaccid paralysis; Infant- floppy baby syndrome; Wound botulism

Treat: Antitoxin (polyclonal Ab from horse); Penicillin

Term
Clostridium perfringens
Definition

Bio: Gram (+) rod; Obligate Anaerobe; Spore-forming (soil); non-motile

Virulence: a-toxin (lecithinase) necrotize tissue

Path: Gas Gangrene (clostridial myonecrosis); necrotizing enteritis causing bloody diarrhea & vomitting

Treat: debridement, high-dose penicillin, hyperbaric O2

Term
Clostridium tetani
Definition

Bio: Gram (+) rod; Obligate Anaerobe; spores in soil

 

Virulence: Tetanus toxin- prevents GABA and glycine release; motile flagella

 

Path: severe muscle contractions; lock jaw

 

Treat: Penicillin; Metronidazole; tetanus vaccine booster; antitetanus immune globulin

Term
Clostridium difficile
Definition

Bio: Gram (+) spore rod; Obligate Anaerobe; difficult to isolate and grow

Virulence: Toxin A (cytotoxin) secretory diarrhea; Toxin B (enterotoxin) neutrophil+cytokine stimulation; Motile flagella

Path: antibiotic-associated colitis; common in hospitalized patients on broad antibiotics

Treat: Oral Metronidazole or Vancomycin

Term
Bacillus anthracis
Definition

Bio: Gram (+) spore rod; Sheep/Goat fur

Virulence: polypeptide capsule; exotoxins- Edema toxin-adenylate cyclase, lethal toxin-zinc metalloprotease; protective antigen

Path: cutaneous anthrax (black ulceration and central necrosis); inhalation anthrax (massively enlarged mediastinal lymph nodes --> pulmonary hemorrhage)

Treat: Ciprofloxacin; vaccinate animals

Term
Bacillus cereus
Definition

Bio: Gram (+) spore rod; Rice dishes;

Virulence: Heat-stable entertoxin-emesis; Heat-labile enterotoxin- diarrhea; Motile; Ocular- cereolysin, phospholipase C, necrotic toxin

Path: Diarrhea + vomiting, gastroenteritis; ocular infection after trauma

Treat: resolves itself

Term
Yersenia pestis
Definition

Bio: Gram (-) rod; Facultative anaerobe; Black Plague

 

Virulence: LPS O-antigen; Lipid A; Capsule Polysacch.; non-motile

 

Path: spread by flea; Bubonic swelling a lymphs; high fever; sepsis; Conjunctivitis

 

Treat: Streptomycin; Gentamicin; Doxycycline

Term

E. coli

Enteropathogenic (EPEC)

Definition

Bio: Gram (-) rod; Lactose fermenter (purple MacConkeys); H2S production; aerobic

 

Virulence: LPS; O-antigen; Lipid A; non-motile

 

Path: infants; watery diarrhea; colony formation on small intestinal epithelium --> microvilli loss (decr. absorption)

 

Treat: symptomatically

Term

E. coli

Enterotoxigenic (ETEC)

Definition

Bio: Gram (-) rod; Lactose fermenter (purple MacConkeys); H2S production; aerobic

 

Virulence: LPS; O-antigen; Lipid A; non-motile

 

Path: small intestine; enterotoxins incr. cAMP/cGMP --> fluid and electrolyte loss; watery diarrhea and low grade fever (traveler's diarrhea); contaminated water

 

Treat: symptomatically

 

Term

E. coli

Enteroinvasive (EIEC)

Definition

Bio: Gram (-) rod; Lactose fermenter (purple MacConkeys); H2S production; aerobic

 

Virulence: LPS; O-antigen; Lipid A; non-motile; shares Shingella virulence factors

 

Path: Large intestine; BLOODY diarrhea with pus, fever, dysentery; invade enterocytes destroying epith. lining causing inflammation and colitis

 

Treat: symptomatically

Term

E. coli

Enterohemorrhagic (EHEC) O157:H7

Definition

Bio: Gram (-) rod; Lactose fermenter (purple MacConkeys); H2S production; aerobic

 

Virulence: LPS; O-antigen; Lipid A; non-motile;

 

Path: Large intestine; watery --> bloody diarrhea; NO fever; hemolytic-uremic syndrome (HUS); Shiga toxin inhibit protein synth.

 

Treat: Symptomatically

Term
Shigella species
Definition

Bio: Gram (-) rod; non-lactose fermenter; non-motile; no H2S produce; Oxidase (-)

 

Virulence: O-antigen; K-antigen (capsule); H-antigen (flagellum); Shiga toxin; adherence

 

Path: AB toxin on Peyer's patches, watery --> bloody diarrhea; daycares; human only reservoir; low inoculum

 

Treat: Fluoroquinolone or TMP-SMX azithromycine

Term
Salmonella typhi
Definition

Bio: Gram (-) rod; non-lactose fermenter; oxidase (-); motile; H2S producer

Virulence: multiple flagella; adhesion fimbriae for gut M protein; LPS; capsule

Path: non-bloody diarrhea; Vi antigen (polysach. capsule); travel in macrophage outside of intestines --> typhoid fever (mimic appendicitis, rose spots, splenomegaly); contaminated eggs, poultry, dairy products

Treat: TMP-SMX fluoroquinolones, ceftriaxone

Term
Pseudomonas aeruginosa
Definition

Bio: Gram (-) thin rod; Non-lactose ferment; Oxidase (+); Obligate aerobe; blue-green pigment; motile; biofilm; fruity smell

Virulence: capsule, LPS, Exotoxin A (elongation factor EF-2, protein synth.); alkaline protease; flagella; antibiotic resistance

Path: BE PSEUDO- Burns, Endocarditis, Pneumonia, Sepsis, External malign. otitis, UTI, Diabetic osteomyelitis; co-colonize with S. aureus in cystic fibrosis

Treat: combination therapy

Term
Neisseria meningitidis
Definition

Bio: Gram (-) diplococci; Oxidase (+); Glucose + Maltose metabolizer; obligate aerobe;

Virulence: Pili; Por proteins (pores); Opa proteins (adhesion); LOS (lipo-oligosach.); IgA proteases; Siderophores (collect iron)

Path: Most cause of meningitis (stiff neck, fever, chills); meningococcemia (sepsis) purpuric rash; Waterhouse-Friderichsen synd. (hemorrhage adrenal glands); respiratory droplets; antiphag. polysach. capsule

Treat: Penicillin; Rifampin (prophylaxis)

 

Term
Neisseria gonorrhoeae
Definition

Bio: Gram (-) diplococci; Oxidase (+); Maltose nonfermenter; obligate aerobe; No capsule; Thayer-Martin medium (chocolate agar)

Virulence: Pili; Por proteins (pores); Opa proteins (adhesion); LOS (lipo-oligosach.); IgA proteases; Siderophores (collect iron)

Path: gonorrhea; urethritis (males); cervicitis (female); gonococcal pharyngitis (uncommon); pelvic inflammatory disease (infertility, ectopic pregnancy); septic arthritis; neonatal gonococcal ophthalmia

Treat: ceftriaxone, azithromycin +tetracyclin+doxycycline if co-chlamydia infection

Term
Mycoplasma pneumoniae
Definition

Bio: Gram insensitive; large virus size (small); NO cell wall; Sterol containing; Facultative anaerobe; slow growin; cold agglutinin test; fried egg culture appearance

 

Virulence: P1 protein (resp. spec. epith. binding);

 

Path: Atypical "walking" pneumonia; low fever; hacking non-producing cough; patchy bilateral infiltrates in chest radiographs

Treat: tetracyclins, macrolides, 4th gen. fluoroquinolones

Term
Rickettsia prowazecki
Definition

Bio:Gram (-) but so small; Obligate Intracellular (do not produce ATP);

 

Virulence: intracellular growth; replication in endothelial cells

 

Path: Louse-borne vector; epidemic typhus (rash and fever); vasculitis

 

Treat: Tetracyclin, Doxycycline

Term
Rickettsia rickettsii
Definition

Bio:Gram (-) but so small; Obligate Intracellular (do not produce ATP);

 

Virulence: intracellular growth; replication in endothelial cells

Path: Rocky Mountain spotted fever; Tick-borne; rash on palms and soles

 

Treatment: Doxycycline

Term
Chlamydia trachomatis
Definition

Bio: Small intracellular (requires host ATP); Gram (-); no peptidylglycan layer (no cell wall); iodine stain

Virulence: Elementary body (EB) coat; Reticulate body (RB) is replicative form; lysozyme resistant

Path: EB ingest into (columnar or transitional epith) cell, RB replicate by binary fission, back to EB before release; neonatal conjunctivitis; trachoma (rough eye); STD: non-gonococcal urethritis; Reiter's syndrome (conjunctivitis, arthritis, urithritis)

Treat: Doxycycline; Azithromycin

Term
Chlamydophila pneumoniae
Definition

Bio: Small intracellular (requires host ATP); Gram (-); no peptidylglycan layer (no cell wall); iodine stain

 

Virulence: Elementary body (EB) coat; Reticulate body (RB) is replicative form; lysozyme resistant

 

Path: Pharyngitis; Bronchitis; Pneumonia; Sinusitis; can cause coronary artery disease

 

Treat: Doxycycline; Erythromycin; Azithromycin

Term
Chlamydophila psittaci
Definition

Bio: Small intracellular (requires host ATP); Gram (-); no peptidylglycan layer (no cell wall); iodine stain;Parrot pneumonia

 

Virulence: Elementary body (EB) coat; Reticulate body (RB) is replicative form; lysozyme resistant

 

Path: Respiratory infection; pulmonary distress; malaise

 

Treat: Doxycycline; Erythromycin; Azithromycin

Term
Treponema pallidum
Definition

Bio: spirochete shaped; Gram (-) but small; obligate anaerobe (unculturable); FTA-ABS treponemal test

 

Virulence: Hyaluronidase; adherenche; immunopathogenesis

 

Path: Syphylis; Primary-painless ulcer (chancre); 2nd- flu, rash, hepatitis; tertiary- neurosyphylis, gumma

 

Treat: penicillin

Term
Borrelia burgdorferi
Definition

Bio: Gram (-) spirochete; motile; darkfield microscopy

 

Virulence: Endotoxin; relapsing fever (antigenic shift); immunopathogenesis

 

Path: Lyme disease, erythema migrans (bulls eye), flulike symptoms, swollen glands, musculoskeletal pain, neurological problems (meningitis, encephalitis), cardiac dysfunction, arthritis

Treat: doxycyclin, amoxicillin (early), ceftriaxone (late)

Term
Mycobacteria tuberculosis
Definition

Bio: Acid-fast stains; lipid (wax) mycosides in cell wall; obligate aerobe; reside in macrophage; "red snappers"

Virulence: waxy outer layer; intracellular growth; cord factor

Path: pulmonary TB, infect alveolar macrophages; caseous granulomas b/c inhibit lysosome fusion; Ghon complex (large perihilar lymphs adjacent to granulomas); prefers apices of lungs (aerated); secondary TB from granulomas; immunosuppressed ptn

Treat: purified protein derivative (PPD test) (BCG vaccine false-positives); Isoniazid; rifampin; multidrug therapy

Term
Mycobacterium leprae
Definition

Bio: acid-fast, rod; aerobe; Wax coat (no complement); high lipid cell wall; Armadillo

Virulence: intracellular growth; neurotropism

Path: leprosy, peripheral nerve and sensory damage, foamy macrophages, TH2; Th1- granulomas with langerhans cells

Treat: dapsone and rifampin

Term
Mycobacterium avium complex
Definition

Bio: acid-fast, rod; aerobe; Wax coat (no complement); high lipid cell wall;

 

Virulence: intracellular growth, neurotropism

 

Path: pulmonary and disseminated disease in AIDs patients

 

Treat: clarithromycin + ethambutol + rifabutin

Term
Vibro cholerae
Definition

Bio: Gram (-); common (S) shaped rod; Oxidase (+); requires salt to grow

 

Virulence: Cholera (AB toxin) A-toxin increase cAMP increase ion and water secretion; single polar flagellum;

 

Path: rice-water diarrhea; shellfish; extreme dehydration; sunken eyes

 

Treat: fluids and electrolytes; doxycycline

Term
Legionella
Definition

Bio: Gram (-) rod; Aerobic; catalase (+); cysteine and iron for growth; AC coolant

 

Virulence: Capsule; growth in macrophage; secrete phospholipase A

 

Path: Pontiac fever (flulike); pneumonia

 

Treat: erythromycin and rifampin

 

Term
Facultative Intracellular Microbes
Definition

Salmonella

Neisseria

Brucella

Mycobacterium

Listeria

Francisella

Legionella

Yersinia

"Some Nasty Bugs May Live FacultativeLY"

Term
Obligate Anaerobes
Definition

Actinomyces

Bacteroides

Clostridium

lack catalase or superoxide dismutase

"Anaerobes know their ABCs"

Term
Obligate Aerobes
Definition

Nocardia

Pseudomonas aeruginosa

Mycobacterium tuberculosis

Bacillus

"Nagging Pests Must Breathe"

Term
Culture Requirements
Definition

N. gonorrhoeae - Thayer-Martin

M. tuberculosis - Lowenstein-Jensen

Lactose fermenters - MacConkey (turns pink)

Legionella - Charcoal yeast

Term
Obligate Intracellular Microbes
Definition

Rickettsia

Chlamydia

 

must use host ATP, have ADP/ATP translocator

Term
Osteomyelitis
Definition

Pseudomonas - if diabetic

 

Salmonella typhi - sickle cell

 

Staphylococcus aureus

Term
Capsule
Definition

(+) Quellung reaction

 

Strep. pneumoniae

B. anthracis

H. influenzae

N. meninigitidis

Klebsiella pneumoniae

S. typhi

E. coli

Pseudomonas

Term
Gram (+) identification
Definition
Nostres: Novobiocon
Term
Strepticocci viridans
Definition
Dental infections, endocarditis, a-hemolytic, optichan resistant
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