Diagnosis Flashcards
(21 cards)
What sample is collected to test for meningitis and what type of detection is this?
CSF
Whole organism, direct detection
How do you detect C. diff?
Clostridiodies dificile glutamate dehydrodense (GHD) and toxin detection tests, like lateral flow, 96well format
What type of sample can you find Campylobacter jejuni from?
Stool
What is beta hemolysis
Complete lysis of RBCs, clear zone
What is alpha hemolysis
Partial lysis of RBSs –> green zone
What is gamma hemolysis
No hemolysis
Is Staphyloccocus gram positive or neg
Positive
Is streptococcus Gram positive or neg
Positive
Are staph. catalse positive or negative
Positive
Are Strep. spp. catalse positive or neg
Negative
What do you grow Strep. spp. on to test for hemolysis
Blood agar
What Streptococcus spp. has alpha hemolysis
Viridans streptococcocus
What agar would you grow on to test lactose fermentation
MacConkey
Are enterboacteriaceae lactose fermenters?
Yes
For lactose non-fermenters, if there is an oxidase positive test what genus would it likely be?
Psuedomonas
What is seroconversion in immunological tests?
Change from negative to positive result from one test to another
What is titre in immunological testing?
1/greatest dilution at which Ab is detectable
How big of an increase in titre corresponds to infection?
Fourfold
What assay is used to detect TB?
IFN-gamma release
What antibody is detected in immunological assay?
IgM
