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19 Cards in this Set

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  • Back
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streptococci
chains - cocci
ex. Streptococcus pyogenes
staphylococci
grapelike clusters cocci
ex. Staphylococcus aureus
Micrococci
groups of four tetrads cocci
Diplococci
two pair-cocci
ex. Streptococcus pneumonie
Catalase test quality control
Staphlococcus aureus- catalase (+)
Streptococci pyogenes- catalase (=)
Positive- observe bubbling
Negative- no bubbling
Coagulase test quality control
Staphylococcus aureus - (+)

Staphylococcus epidermids- (=)
Positive reaction- pink clumping
Negative- no clumping
roate for 5 seconds
Staph aureus
1. Gram Positive Cocci-
2. Beta-hemolytic
3. Catalase (+)
4. Coagulase (+)
Staph Epidermidis
1.GPC
2. Non-hemolytic
3. catalase (+)
4. Coagulase (=)
Staph. saprophyticus
1. GPC
2. Non-hemolytic
3. Catalase (+)
4. Coagulase (=)
alpha (A)
partial lysis of red blood cells around colony greenish discoloration
Beta (B)
Complete lysis of red blood cell around colony clear area around colony
Streptococci agalctiae, Streptococci pyogenes.
NonHemolytic
No lysis of red blood cells around colony no change in agar.
gram-negative diplococci
N. meningitidis
gram-positive diplococci (lancet shaped)
S. pneumoniae
gram-negative pleomorphic
H. influenzae
Oxidase test QC
Positive- Escherichia coli

Negative- Pseudomonas Aeruginosa
Positive reaction- Purple or dark color within 20 sec

Negative- no color change
Indole test QC
Positive- Escherichia coli

Negative- Kiebsiella pneumonie
Positive reaction: Blue to blue/green

negative: No color or pink

within 2 minutes
P disk- test opotchin suscpetibility
greater > 15mm S.pneumoniae

less 15mm Virdians streptococcus group
Bacitracin susceptibility "A disk"
Susceptibility- growth

Resistant- no growhth
"S" Group A streptococcus pyogenes

"R" Group B streptococcus Agalactiae