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29 Cards in this Set
- Front
- Back
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T or F. blood cultures contaminated with bacti from skin can account for up to 50% of all positive cultures
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true!
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____ and most ______ infections can be dx by microscopy alone to the genus and species level
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helminths
protozoans |
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name two samples where you do not do gram stains because of NF
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strep throat samples
stool samples for salmonella |
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how does KOH stain work
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host cell disolve but fungal stays
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what are four ways to diagnose by LMq
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gram stain
acid fast KOH prep wet prep |
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MacConkey plate differentiates ____ on ability to _____
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GNR
ferment lactose |
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On macconkey pink means
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lactose fermenter
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What do PEA and CNA plates do
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inhibit GNR and allow GPC
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when might you select a PEA or CNA plate
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from stool when trying to get strep or staph in a sea of GNR
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____ and ____ remain 100% susceptible to penicilli and do not require susceptibility testingq
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strep pyogenes
treponema pallidum |
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t or f you don't need to test strep for penicillin suscept
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true!
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MIC, kirby bauer and E test are all
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susceptibility testing
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T or F all strep have catalase
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FALSE
all STAPH have catalase |
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what four organisms do you need to know that grow on EMB
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e coli
klebsiella pneumo proteus mirabilis pseudomonas aeruginosa |
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which GNRs that you know are lactose fermenters and would turn the EMB pink?
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e coli
klebsiella pneumo |
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which GNRs produce urease
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klebsiella penumo
proteus mirabilis |
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which GNRs make oxidase
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pseudomonas aeruginosa
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which GNR produces metallic green sheen on EMB
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e coli
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whihc GNR produces green pigment and a grapelike odor
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pseudo aeruginosa
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which GNR produces mucoid colonies due to capsule
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klebsiella
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which GNR swarms over the surface of EMB and blood agar
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proteus
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___ is produced when a pt first encounters pathogen and disappears a relatively short time afterward
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igM
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T or F IgM can cross the placenta
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false, so igM indicates infection
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a __ increase in IgG from acute and convalescent sample suggests diagnosis
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IgG
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what are some cons of antigen testing
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need separate tests for different infections
can't do further tests |
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what does DFA test detect
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chlamydia trachomatis
treponema pallidum STI |
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what is PCR used to dectect
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MRSA
chlamydia trachomatis N gonorrheae mycobacteria CMV HSV HBV HIV |
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where is MIC on an E test
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where the inhibition starts
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what does the agglutinin test tell you about
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group a strep
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