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Step 1 - Microbiology 2
micro 2
93
Medical
Graduate
03/14/2014

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Term
Systemic Mycoses
Definition
All are dimorphic, tx fluconazole and itraconazole. Ampho B for systemic infection
Cocci, Histo, Blasto, Paracocci
Term
Histoplasmosis
Definition
Mississippi and Ohio river valleys
Macrophages filled with histo
Bird or bat droppings
Term
Blastomycosis
Definition
East of the mississippi river and central america
Inflammatory lung dz
Disseminate to skin and bone
Granulomatous nodules
Broad based budding
Term
Coccidiomycosis
Definition
Southwestern US, California
Pneumonia and meningitis
Dissemiinate to bone and skin
Spherule filled with endospores, arthroconidia in soil
Term
Paracoccidiomycosis
Definition
Latin America
Budding yeast with captains wheel
Disseminates quickly
Term
Tinea Versicolor
Definition
Malessezia furfur
acids that damage melanocytes causing hypo pigmented or hyper pigmented patches
Occurs in hot humid weather
Spaghetti and meatball
Miconazole or selenium sulfide
Term
Candidia Albicans
Definition
Thrush, vulvovaginitis (DM), diaper rash, endocarditis (IVD), disseminated, chronic mucocutaneous
Tx: topical azole, fluconazole or capsufungin (oral/esophageal)
Fluconazole, ampho B or capsofungin for systemic
Term
Aspergillus fumigatus
Definition
Invasive - immunocompromised and those with CGD
Allergic bronchopulmonary - asthma or CF
Aspergillomas - after TB
*branches at Acute angles
Tx: voriconazole and lipid ampho B
Term
Cryptococcus neoformans
Definition
Cryptococcal meningitis, cryptococcosis
Encapsulated yeast
Pigeon droppings
Inhalation with hematogenous spread to the meninges
Culture on sabarouds agar, india ink
*soap bubble lesions in brain
Term
Mucor and Rhizopus
Definition
Mostly in ketoacidotic diabetic and leukemic patients
Proliferate in the blood vessel walls when there is excess ketones or glucose
Rhonocerebral frontal lobe abscess
HA, facial pain, black necrotic eschar on face
90 degree branching
Term
Pneumocystis jirovecii
Definition
PCP pneumonia
immunosuppression predisposes to dz
Diffuse bilateral CXR appearance
Disc shaped yeast forms on silver stain
Tx: Bactrom, pentamidine, dapsone
Start prophylaxis when CD4 < 200
Term
Sporothrix Schenckii
Definition
Sporotrichosis. Dimorphic cigar shaped budding yeast
Typically introduced by a thorn
Nodules along a draining lymphatics
Tx: itraconazole or potassium iodidie
Term
Giardia
Definition
Bloating, flatlence, *fatty diarrhea
Cysts in water TM
Trophozoites or cysts in stool
Tx: Metronidazole or Tindazole
Term
Entamoeba histolytica
Definition
Bloody diarrhea, liver abscess (anchovy paste exudate"
Flask shaped ulcer
Cysts in water TM
Trophozoites with RBCs in the cytoplasm
Tx: metronidazole or iodoqinol
Term
Cryptosporidium
Definition
Severe diarrhea in AIDS
mild dz in normal people
Cysts in water
Acid fast stain
Nitazoxanide
Term
Toxoplasma gondii
Definition
Brain abscesses in HIV
Ring enhancing lesions
congenital Triad - chorioretinitis, hydrocephalus, intracranial calcifications
Cysts in meat or cat feces
Tx: sulfadiazine and pyrimethamine
Term
Naegleria fowleri
Definition
Rapidly fatal meningoencephalitis
Swimming in freshwater lakes
Ameobas in spinal fluid
Amphotercin B
Term
Trypanosome brucei, gambiense, rhodesiense
Definition
African sleeping sickness - enlarged lymph nodes, recurring fever, somnolence, coma
Tsetse fly, a painful bite
Tx: suramin for blood borne, melarsoprol for cns penetration
Term
P. vivax, ovale, falciprum, malariae
Definition
Malaria - fever, HA, anemia, splenomegaly
Vivax/ovale - 48 hr cycle, hynozoite in liver
Falciprum - severe, irregular fever patterns, parasitized RBCs occulde cappillaries in brain, kidneys, lung
Malariae - 72 hr cycle
TM- anopheles mosquito
Blood smear - trophoziote form (RBC with schizonts)
Tx: Chloroquine, use mefloquine, quinidine (not for G6pd)
Primaquine for hyponoziote
Term
Babesia
Definition
Babesiosis- fever and hemolytic anemia
Northeaster US, asplenia, increased risk of severe disease
Ixodes tick (same as lyme dz)
Blood smear, ring form
*Maltese cross
Tx: Atovaquone and azithromycin
Term
Trypanosoma cruzi
Definition
Chagas dz - dilated cardiomyopathy, megacolon, megaesophagus (south america)
Reduviid bug - kissing bug (painless)
Nifurtimox
Term
Leishmania donovani
Definition
Visceral leishmaniasis - spiking fevers, hepatosplenomegaly, pancyotpenia
TM - sandfly
Macrophages containing amastigotes
Sodium stibogluconate
Term
Trichomonas vaginalis
Definition
Foul smelling, greenish discharge, itching a burning
Sexual contact TM
Trophoziotes, motile on wet mount
Tx: metronidazole patient and partner
Term
Enterobius vermicularis (pinworm)
Definition
Fecal Oral TM
Intestinal infection causes anal pruritis
Tx: bendazoles or pyrantel pamoate
Term
Ascaris lumbricoides (giant roundworm)
Definition
fecal oral; eggs visible in feces
intestinal infection, into the lungs via the veins
Bendazoles, or PP
Term
Stronglyoides stercoralis
Definition
Larvae in soil penetrate the skin
Intestinal infection causing N, V and anemia
Ivermectin or albendazole
Term
Ancylostoma duodenale, necator americanus (hookworms)
Definition
Larvae penetrate the skin
Intestinal infection causing anemia
bendazoles or PP
Term
Dracunulus medinensis
Definition
Drinking water
Skin inflammation and ulceration
Slow extraction of worm
Term
Onchocerca volvulus
Definition
Female blackfly bite
Hyperpigmented skin and river blindness, black skin nodules
Ivermectin
Term
Loa Loa
Definition
Deer fly, horse fly, mango fly
Swelling in skin, worm in the conjunctiva
Diethylcarbamazine
Term
Taenia solium
Definition
Larvae in undercooked pork
Intestinal infection
*neurocysticercosis
TM- Praziquantel, bedazzles for neuro
Term
Diphyllobothrium latum
Definition
Ingestion of larvae from raw freshwater fish
Vit B12 deficiency
Praziquantel
Term
Echinococcus
Definition
Ingestion of eggs from dog feces
Cysts in liver causing anaphylaxis of antigens released
Bendazoles
Term
Schistosoma
Definition
Snails are host, cercariae penetrate skin of humans
Liver and spleen granulomas, fibrosis, inflammation
Chronic infection with S. haematobium can lead to SCC of bladder
Tx: Praziquantel
Term
Clonorchis sinensis
Definition
Undercooked fish
Biliary tract infection - pigmented gallstones
Assoc with cholangiocarcinoma
Tx: Praziqunatel
Term
Paragonimus westermani
Definition
Undercooked crab meat
Lung inflammation and secondary bacterial infection with hemoptysis
Tx: Praziquantel
Term
Live attenuated viruses
Definition
Induce humoral and cell mediated immunity
Smallpox, yellow fever, chickenpox, sabins polio virus, MMR, influenza (intranasal)
Term
DNA viruses (basics)
Definition
All DNA viruses are DS except for the parvoviridae
All are linear except papilloma - polyoma and hepadnaviruses
Term
RNA viruses (basics)
Definition
All are single stranded except Reoviridae
Pos stranded: Retroviruses, toa, flavivirus, corona virus, hepevirus, calcivirus, picornavirus
Term
Replication
Definition
All DNA viruses replicate in the nucleus except poxvirus
All RNA replicated in the cytoplasm except influenza and retroviruses
Term
Naked Viruses
Definition
Pappillomavirus, adenovirus, picornavirus, polyomavirus, calcivirus, parvovirus, reovirus, hepevirus

"Give PAPP smears and CPR to the naked hippy"
Term
Hepadnavirus
Definition
HBV, parital circular
Term
Adenovirus
Definition
Sore throat, hemorrhagic cystitis, penumonia, conjunctivitis
Pink eye
Term
Parvovirus
Definition
Single stranded
B19- aplastic crisis in sickle cell patients
*slapped cheeks appearance in kids
Fifth disease - erythema infectiosum
Hydrops fetalis, rheumatoid arthritis
Term
Papillomavirus
Definition
Circular
HPV
Term
Polyoma virus
Definition
JC - progressice multifocal leukoencphalopathy
BK - transplant patients, targets the kidney
Term
Pox virus
Definition
Smallpox
Molluscum contagiosum - flesh colored dome lesions with central dimple
Term
HSV-1
Definition
Gingivostomatitis, keratoconjunctivitis
*Temporal lobe encephalitis
Latent in the trigeminal ganglia
Term
HSV-2
Definition
Herpes genitalias
Latent in the sacral ganglia
Multiple painful vesicles
Term
HSV-3 (VZV)
Definition
Chicken pox, shingles, encephalitis, pnuemonia
Latent in the dorsal root or trigeminal ganglia
Term
HSV-4 (EBV)
Definition
Infecitous mono, Burkitt's lymphoma, nasopharyngeal carcinoma,
Latent in B cells
Term
HSV-5 (CMV)
Definition
Congenital infection, mononucleosis (negative monospot)
Pneumonia, retinitis,
"Owls eye inclusion"
Term
HHV-6
Definition
Roseola- high fevers for several days tha can cause seizures, followed by diffuse macular rash
Term
HHV-8
Definition
Kaposi's sarcoma (HIV pts)
Term
HSV identification
Definition
PCR is test of choice, Can also use Tzank test
Cowdry A inclusions - Infected cells have intranuclear inclusions
Term
EBV
Definition
Mononucleosis
Fever, hepatosplenomegaly, pharyngitis and lymphadenopathy
Atypical lymphocytes seen on peripheral blood smear are not infected B cells but reactive T cells
Term
Reoviruses
Definition
*Double stranded
Coltivirus - colorado tick fever
*Rotavirus - Top cause of fatal diarrhea in children
Term
Picornavirus
Definition
Poliovirus
Echovirus - aseptic meningitis
Rhinovirus - common cold
Coxsackievirus - aseptic meningitis, hand-foot-mouth disease, myocarditis
HAV- acute viral hepatitis
PERCH
Term
Hepevirus
Definition
HEV
Term
Calicivirus
Definition
Norovirus- viral gastroenteritis (cruise ships)
Term
Flavivirus
Definition
HCV
Yellow fever
Dengue,
St Louis encephalitis
West Nile Virus
Term
Togavirus
Definition
Rubella
Eastern and Western Equine virus
Term
Retrovirus
Definition
HTLV - T cell leukemia
HIV
Term
Coronavirus
Definition
Coronavirus - common cold and SARS
Term
Orthomyxovirus
Definition
Influenza virus
Term
Paramyxovirus
Definition
Parainfluenza - croup
RSV - bronchiolitis in babies
Measles, Mumps
Term
Rhabdovirus
Definition
Rabies
Term
Filovirus
Definition
Ebola/Marburg hemorrhagic fever
Term
Arenavirus
Definition
Circular genome
LCMV- lymphocytic choriomeningitis
Lassa fever encephalitis - spread by mice
Term
Bunyavirus
Definition
circular
California encephalitis
Sandfly rift valley fever
Crimean-congo hemorrhagic fever
Hantavirus - hemorrhagic fever, pneumonia
Term
Delta virus
Definition
HDV
Term
Negative stranded viruses
Definition
Arenavirus, bunyavirus, paramyxovirus, orthomyxovirus, filovirus, rhabdovirus
"Always Bring Polymerase Or Fail Replication"
Term
Rhinovirus
Definition
Picornavirus
Common cold
Destroyed by stomach acid
Term
Yellow Fever
Definition
Flavivirus
TM aedes mosquito
Virus has a monkey or human reservoir
*High fever, black vomitus, jaundice
Term
Rotavirus
Definition
*Most important cause of infantile gastroenteritis
Common cause of acute diarrhea during the winter months
Villous destruction with atrophy, leads to decreased absorption of Na and loss of K
Term
Dengue Fever
Definition
Most prevalent mosquito borne viral dz worldwide
"break bone fever" - mm, joint pain, HA, retroorbital pain
Hemorrhagic fever
*Tournequet test - petechiae=pos
Term
Influenza virus
Definition
Orthomyxovirus
Hemagluttinin and neuraminidase
Patients at risk for fatal bacterial superinfection
Term
Genetic Shifts
Definition
Cause pandemics - reassortment of the viral genome
Term
Rubella
Definition
Togavirus, German Measeles
Fever, postauricular adenopathy, lymphadenopathy, arthralgias
Fine truncal rash that starts at the head and moves down
Serious congenital disease
Term
Paramyxovirus
Definition
Croup- seal like barking cough, mumps, measles
RSV- causes a respiratory tract infection in infants
All contain F protein which causes resp cells to fuse and form multinucleate cells
*Tx: palivizumab
Term
Measles virus
Definition
Paramyxovirus
Koplik spots and descending maculopapular rash
Subacute sclerosing panencephalitis in the future
Encephalitis and giant cell pneumonia
*cough, coryza, conjunctivitis
Term
Mumps
Definition
A paramyxovirus
Parotitis, orchitis, and aseptic meningitis
Can cause sterility
Term
Rabies Virus
Definition
Bullet shaped, negri bodies in neurons
Purkinje cells of the cerebellum
Post exposure tx is wound cleansing and vaccine with/without rabies immune globulin
Term
HBV
Definition
Acts as a reverse transcriptase. Gets into the genome, acts as an oncogene
Term
HIV
Definition
Env gp120 and gp41
120- attachment to host CD4 T cell
41- fusion and entry
gag (p24) - capsid protein
pol - reverse transcriptase, aspartate protease, integrase
Virus binds CCR5 early or CXCR4 late
Binds CCR5 and CD4 on macrophages
Term
HIV diagnosis
Definition
ELISA, Western blot
Aids = <200 CD4
Anti-gp120 crosses the placenta
Term
Systemic AIDS illness
Definition
Histoplasma capsulatum - low grade fevers, cough, hepatosplenomegaly, tongue ulcer
oval yeasts in macrophages
Term
Dermatologic
Definition
Fluffy white cottage cheese lesions - C albicans
Superficial vascular proliferation - Bartonella heneselae (bacillary angiomatosis) - Neutrophilic inflammation
Term
GI
Definition
Chronic watery diarrhea - Cryptosporidium
acid fast cysts seen in stool
Term
Neurologic
Definition
Encephalopathy - JC virus reactivation
Abscess- Toxo, ring enhancing lesions
Meningitis - Cryptococcus, india ink stain
Retinitis - CMV, cotton wool spots
Term
Oncologic
Definition
Kaposi sarcoma - HHV-8 (lymphocyte)
Hairy Leukoplakia - EBV
Non hodgkin lymphoma - EBV, Waldeyer ring
Squamous cell carcinoma - HPV, often in anus
Primary CNS lymphoma - EBV, focal or multiple
Term
Respiratory
Definition
Intersitital pnuemonia - CMV, owls eye cells
Invasive aspergillosis - Aspergillus
Pneumonia - pneumocystis jirovecci
Tuberculosis disease - MAC
Term
Prions
Definition
Disease caused by the conversion of normal protein to B pleated form
PrPsc resists degredation and facilitates conversion of still more proteins
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