Biochemical Tests Flashcards
Microdase reagent
Tetramethly paraphenylene diamine dihydrochloride
Positive Result in Microdase Test
Dark blue
(+) Micrococci
Catalase test reagent
3% H2O2
Positive result in Catalase Test
Gas formation
Bubbles
Effervescence
(+) Staphylococcus, Micrococcus (-) Streptococcus
Organism detected by Superoxol test
Neiserria gonorrhea
Superoxol reagent
30% H2O2
Detected in Slide coagulase tets
Bound coagulase “Clumping factor”
Detected in Tube coagulase test
Free coagulase “Coagulase reacting factor”
If slide coagulase is negative, what test is followed?
Tube test
rationale: negative slide must be confirmed with tube test
If tube test is negative, what shoul you do next?
Reincubate at RT from 18-24 hrs
Coagulase test reagent
EDTA rabbit plasma
Test that differentiate S, aureus from other Staphylococci
Coagulase test
Test that differentiate Staphylococci, Micrococci from Streptococci
Catalase test
Test that differentiate coagulase negative staphylococci
Novobiocin susceptibility test
Positive result of Novobiocin
Zone of inhibition > 16 mm
Susceptible - S. epidermidis; Resistant - S. saprophyticus
Positive Result in DNA Hydrolysis
Colorless/Clear zone
(+) MASSS: Moraxella, Aeromonas, S. aureus, Serratia, Stenotrophomonas
Positive for PYR Test
S. pyogenes
E. faecalis (Enterococci)
Positive result of PYR test
Bright Red or Pink-to-Cheryy Red (De lost)
Bacitracin Disk and Units
Taxo A with 0.04 units
Differentiate Group A from Group B
Bacitracin test
Positive result of Bacitracin test
Zone of inhibition >10 mm
End product of Hippurate hydrolysis
Glycine and Benzoic acid
Positive result of Hippurate hydrolysis
Deep purple
Reagent of SXT susceptibility test
1.25 ug
Differemtiate S. agalactiae from S. pyogenes
CAMP Test
Organism that its helolysis is enhanced by CAMP factor of S. agalactiae
S. aureus
Positive result in CAMP test
Enhanced hemolysis with Arrowhead zone of beta hemolysis
Negative test in CAMP test
No enahancement of hemolysis
Test used to identify S. agalactiae
Hippurate hydroilysis
CAMP test
Causes False positive CAMP test
Incubated anaerobically or in capnophilic environment
CAMP test-plate must be placed in an ambient air incubator at 35C to 37C
Meaning of Quellung
Swelling
Positive test of Neufeld quellung test
Capsulaw swelling
(+) S. pneumoniae, N. meninigitidis
Taxo P disk
Optochin test - ethyl hydrocupreine hydrochloride
Taxo P disk concentration
0.5 ug/ml
Positive Optochin susceptibility test
Zone of inhibition of >14 mm
Confirms for S. pneumoniae after optochin test
Bile solubility test
Positive Bile solubility test
Lysis of colonies
(+) S. pneumoniae
Differentiate Group D (enterococci & non-enterococci) from Viridans group
Bile esculin test