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Microbio - bacteriology
usmle step 1
50
Medical
Graduate
05/26/2009

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Cards

Term
Giemsa stain
Definition
Borrelia, Plasmodium, trypanosomes, Chlamydia
Term
PAS
Definition
Stains glycogen, mucopolysaccharides; use dto diagnose whipple disease!
Term
Ziehl-Neelsen
Definition
Stains acid fast bacteria
Term
India ink
Definition
Cryptococcus neoformans
Term
Silver stain
Definition
Fungi, legionella
Term
Culture requirement for H. influenza
Definition
Chocolate agar with factor V and X
Term
Culture requirement for N. gonorrhea
Definition
Thayer-Martin Media
Term
Culture requirement for B. pertussis
Definition
Bordet-Gengou (potato) agar
Term
Culture requirement for C. diphtheria
Definition
Tellurite plate, Loeffler's media
Term
Culture requirement for M. tuberculosis
Definition
Lowenstein-Jensen agar
Term
Culture requirement for M. pneumonia
Definition
Eaton's agar
Term
Culture requirement for E. coli
Definition
EMB agar (blue black colonies with metallic sheen)
Term
Culture requirement for Lactose fermenting enterics
Definition
MacConkey's agar
Term
Culture requirement for Legionella
Definition
Charcoal yeast extract agar buffered with increased iron and cystein
Term
Culture requirement for Fungi
Definition
Sabouraud's agar
Term
Obligate intracellular bacteria
Definition
rickettsia and chlamydia
Term
Encapsulated bacteria
Definition
Strep pneumo, N. meningitidis, H. influenza, klebsiella pneumonia (some nasties have kapsules)
Term
Urease positive bacteria
Definition
Proteus, Klebsiella, H. pylori, Ureaplasma (particular kinds have urease)
Term
Staph aureus virulence factor
Definition
Protein A - binds FC portion of Ig thereby disruptin opsonization and phagocytosis
Term
IgA protease (what it does and what organisms have it)
Definition
cleaves IgA and prevents phagocytosis; S. pneumo, H. flu, Neisseria
Term
Group A strep virulence factor
Definition
M protein; helps prevent phagocytosis by inhibiting activation of complement (also antigenic!)
Term
Facultative Intracellular organisms
Definition
Salmonella, Neisseria, Brucella, Mycobacterium, Listeria, Francisella, Legionella, Yersinea (Some nasty bugs may live facultativeLY); inhibit phagosome lysosome fusion!
Term
Tetanospasmin
Definition
C. tetani neurotoxin; blocks release of GABA and glycine form inhibitory neurons; uncontrolled muscle contraction with lockjaw and paralysis of respiratory muscles
Term
Botulinum toxin
Definition
C. botulinum neurotoxin; inhibits acetycholine release from motro neuron endplates; Flacid paralysis with resp muscle paralysis
Term
Choleragen
Definition
V. Cholera enterotoxin; A-B toxin; ADP ribosylation of GTP-binding protein -- activates adenylate cyclase -- inc cAMP -- inc NaCl secretion; rice water diarrhea
Term
E. coli Labile toxin (LT)
Definition
similar to cholera toxin; in E. coli, C. jejuni, B. cereus; stimulates adenylate cyclase (labile like the Air)
Term
E. coli stable toxin (ST)
Definition
E. coli, Y. enterocolitica; activates guanylate cyclase to produce GMP -- inhibition of NaCl absorption
Term
Shiga toxin and Shiga-like toxin
Definition
Shigella and E. coli O157:H7; inhibits protein synthesis bu inactivating 60s killing absorptive cells; bloody diarrhea, HUS!
Term
Staph Heat stable toxin
Definition
FOOD POISONING; diarrhea and vomitting for less that 24 hrs
Term
B. cereus heat stable toxin
Definition
FOOD POISONING; vomitting less that 24 hrs with limited diarrhea
Term
Strep pyrogenic toxin
Definition
Group A strep (strep pyogenes); SUPERANTIGEN: activates IL-1 and other sepsis mediators and large numbers of T cells; SCARLET FEVER; COMES FROM BACTERIOPHAGE BY LYSOGENIC CONVERSION
Term
TSST-1
Definition
Staph aureus; SUPERANTIGEN; causes toxic shock syndrome (fever, rash, shock)
Term
Strep Pyogenes exotoxins
Definition
Hemolysin O and S (lyses RBCs), Streptokinase (lyses fibrin clots), DNAses (hydrolyze DNA); Hyaluronidase (breaks down proteoglycans), NADase; ABscesses, skin infections, systemic infections
Term
Staph aureus exotoxins
Definition
Lipases, penicillinases, staphylokinase, leukocidin, exfoliatin (epithelial cell lysis), factors that bind complement; abscesses, skin infections, systemic infection
Term
causes scalded skin syndrome
Definition
exfoliatin (staph aureus)
Term
C. perfringens exotoxin
Definition
Alpha toxin: hyfrolyzes licithin in cell membranes causing cell death; tissue destruction and gas gangrene
Term
Bacillus anthracis toxins
Definition
Edema factor (adenylate cyclase--inc cAMP in neuts and macrophages inhibiting ability to phagocytose), protective antigen (allows binding), lethal factor (inactivates protein kinase)
Term
Diphtheria toxin
Definition
A-B toxin; ribosylates EF and inhibits translation; myocarditis, peripheral nerve palsies, CNS effects; obtains from lysogenic conversion
Term
Pertussis toxin
Definition
Increases cAMP by inibiting Galpha1 (inhibitory receptor); also inhibits chemokine receptor causing lymphocytosis; whooping cough
Term
C diff toxins
Definition
Toxin A: fluid secretion and mucosal inflammation -- diarrhea; Toxin B: cytotoxic to colonic epithelial cells; PSEUDOMEMBRANOUS ENTEROCOLITI
Term
Pseudomonas exotoxin
Definition
Exotoxin A; inhibits EF2 (same as diphtheria) and inhibits protein synthesis; targets liver
Term
cAMP inducing bacteria
Definition
V. cholera (activates Gs); B. pertussis (inactivates Gi); E.coli heat labile toxin; Bacillus anthracis (edema factor is an adenylate cyclase)
Term
Bacterial toxins encoded in lysogenic phage
Definition
ShigA-like toxin, Botulinum toxin, Cholera toxin, Diphtheria toxin, Erythrogenic toxin of strep pyogenes (ABCDE)
Term
Novobiocin
Definition
Staph: saprophyticus resistant; epidermidis sensitive (NO StRES)
Term
Optochin
Definition
Strep: viridans resistant; pneumonia sensitive (OVRPS)
Term
Bacitracin
Definition
Strep: Gp B resistant; Gp A sensitive (B-BRAS)
Term
Alpha hemolytic bacteria
Definition
Strep pneumo (optochin sens), Viridans strep (optochin resistant)
Term
Beta hemolytic bacteria
Definition
S aureus (coagulase pos), Strep pyogenes (GAS- bacitracin sens), Strep agalactiae (GBS - bacitracin resistant),Listeria Monocytogenes (tumbling)
Term
Lactose fermenting bacteria
Definition
Pink on MacConkey; Citrobacter, Klebsiella, E. coli, Enterobacter, Serratia
Term
Things that cause Palm and sole rash
Definition
Coxsackievirus A infection (hand, foot and mouth disease), RMSF, Syphilis (CARS)
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