Other Gram positive cocci

Question 1

GPC Genera of clinical significance

Answer 1

1) Staphylococcus- Catalase positive

2) Micrococcus - Catalase positive

3) Macrococcus
Large GPC found in usually horses

4) Rothia Catalase negative
R. mucilaginousa: encapsulated gram-positive coccus that is a part of the normal human respiratory microbial flora.

Question 2

Micrococcus and related genera

What do they cause?

Answer 2

Kocuria species

Kytococcus species

Micrococcus species.

bacteremia
peritoneal dialysis-associated peritonitis
septic arthritis, meningitis
native valve and prosthetic valve endocarditis.

Question 3

Diseases associated with
R. mucilaginousa

in immunocompromised patients

Answer 3

1) native valve and prosthetic valve endocarditis

2) bacteremias

3) peripheral and central line-associated sepsis

3)pneumonia

4) meningitis

5) vertebral osteomyelitis

6). cholangitis

Question 4

Catalase positive/negative

Staph

Micrococcus

Rothia

Kocuria

Answer 4

Staph Cat +, Coagulase +

Micrococcus: Cat + , Coagulase -

Rothia mucilaginosa: Catalase variable

Kocuria: Cat +, Coagulase -

Strep and Enterococci are Catalase negative!

Question 5

How are CoNS differentiated from Micrococcus, Kocuria, Kytococcus?

Answer 5

Oxidase tests!

CoNS = oxidase negative

Micrococcus, Kocuria, Kytococcus = oxidase positive

or Bacitracin sus

Micrococcus generally showing sensitivity to bacitracin unlike most CoNS which are resistant