Example Gram Stain Readings for Exam

Question 1

G(+) coagulase(+) cocci in clusters

Answer 1

Staph aureus

Question 2

G(+) coagulase(-) cocci in clusters

Answer 2

Staph epidermidis

Staph saprophyticus

Question 3

G(+) cocci, non-hemolytic, in pairs and chains

Answer 3

Enterococcus faecium

Enterococcus faecalis

Question 4

G(+) cocci, alpha-hemolytic, in pairs and chains

Answer 4

Strep pneumoniae

Strep viridans

Question 5

G(+) cocci, beta-hemolytic, in pairs and chains

Answer 5

Strep progenies (Grp A)
Strep agalactiae (Grp B)
Grp C, D, G

Question 6

G(-) rod/bacilli, non-lactose fermenter

Answer 6

Pseudomonas
Acinetobacter
Stenotrophomonas
Burkholderia

Question 7

G(-) rod/bacilli, lactose fermenter

Answer 7

Vibrio

Aeromonas