Gram Positive Cocci

Question 1

GPC
Catalase +

Answer 1

Micrococcus
Staphylococcus

Question 2

GPC
-Catalase +
-Coagulase +

Answer 2

Staph aureus & intermedius
-salt tolerant
-beta hemolytic
-exfoliative/enterotoxins
-hyaluronidase
-50% carry organism on skin or nares

Question 3

GPC
-Catalase =

Answer 3

Streptococcus

Question 4

GPC
Streptococcus
-Alpha Hemolytic
-Optochin disc - S

Answer 4

S. pneumoniae
-lancet shaped
-glistening/wet domes
-bile solubility +
-requires CO2, brain-heart infusion agar, Trypticase soy agar, choc agar
-polysaccharide capsule protects from phagocytosis
-causes pneumonia and meningitis in adults, otitis media in children

Question 5

GPC
Streptococcus
-Alpha Hemolytic
-Optochin disc - R
-Bile Esculin =

Answer 5

S. viridans
-normal flora of upper respiratory tract
-causes dental infections
-can cause subacute bacterial endocarditis if in bloodstream
-grows on low O2
-can be found in abscesses of brain/abdomen

Question 6

GPC
Streptococcus
-Alpha Hemolytic
-Optochin disc - R
-Bile Esculin +
-PYR 6.5% NaCl =

Answer 6

Group D

Question 7

GPC
Streptococcus
-Alpha Hemolytic
-Optochin disc - R
-Bile Esculin +
-PYR 6.5% NaCl +

Answer 7

Enterococcus

Question 8

GPC
Streptococcus
-Beta Hemolytic
-PYR/Bacitracin +/S

Answer 8

S. pyogenes (Group A)
-strep throat
-scarlet fever

Question 9

GPC
Streptococcus
-Beta Hemolytic
-PYR/Bacitracin =/R
-Hippurite +

Answer 9

S. agalactiae (Group B)
-bile +
-normal flora of genitourinary tract

Question 10

GPC
Streptococcus
-Beta Hemolytic
-PYR/Bacitracin =/R
-Hippurite =
-Bile Esculin =

Answer 10

Beta hemolytic strep that is NOT group A, B, or D

Question 11

GPC
Streptococcus
-Beta Hemolytic
-PYR/Bacitracin =/R
-Hippurite =
-Bile Esculin +
-PYR 6.5% NaCl =

Answer 11

Group D

Question 12

GPC
Streptococcus
-Beta Hemolytic
-PYR/Bacitracin =/R
-Hippurite =
-Bile Esculin +
-PYR 6.5% NaCl +

Answer 12

Enterococcus