Gram + (Cocci)

Question 1

What test splits up cocci into staph and strep?

Answer 1

Catalase
+ = bubbles —> (staph)
- = no bubbles —> (strep)

Question 2

What category is catalase (-)?

Answer 2

Strep, chains

Question 3

What category is catalase (+)?

Answer 3

Staph, cluster

Question 4

What test splits strep (-,chains) into alpha, beta, and gamma?

Answer 4

Hemolytic
-alpha (partially breaks down RBCs; green zone)
-beta (completely breaks down RBCs; clear/yellowish zone)
-gamma (no hemolysis)

Question 5

What test splits staph (+, clusters) into clot and no clot groups?

Answer 5

Coagulase
+ = presence of coagulase coverts fibrogen to fibrin (clot)
- = no clot

Question 6

Alpha-hemolytic

Answer 6

-Viridans streptococci
-Strep. pneumoniae

Question 7

Beta-hemolytic

Answer 7

-Group A Strep. pyogenes
-Group B Strep. agalactiae

Question 8

Gamma-hemolytic

Answer 8

Enterococcus

Question 9

Coagulase (+)

Answer 9

Staphylococcus aureus

Question 10

Coagulase (-)

Answer 10

-Coagulase negative staph. (CoNS)
-Staphylococcus epidermidis

Question 11

Gram (+) cocci anaerobic

Answer 11

Peptostreptococcus