Lab 1 - Staphylococcus and Micrococcus

Question 1

Morphology of Staphylococcaceae and Micrococcaceae

Answer 1

spherical
G pos cocci
single, pairs, short chains, irregular cluster

No specific growth of atmosphere requirements

Question 2

Predominant pathogen

Answer 2

Staphylococcus aureus
gop(h), wop(h)
gpccl

wound infections, boils, impetigo

Question 3

Common CNS

Coagulase-negative staphylococci

Answer 3

Staphylococcus lugdunensis
Staphylococcus epidermidis
Staphylococcus saprophyticus
Staphylococcus intermedius

Question 4

Staphylococcus lugdunensis

Answer 4

Biofilm
Invasive disease
wop(h)
gpccl

resembles S. aureus

Question 5

Staphylococcus epidermidis

Answer 5

Biofilm
Instrumentation procedures and prosthetic devices: heart valves cause subacute bacterial endocarditis
wop, pwop, woph
gpccl

Question 6

Staohylococcus saprophyticus

Answer 6

Urinary tract infection
wop, wopm (wet)
gpccl

Question 7

Staphylcoccus intermedius

Answer 7

Wound specimen
Zoonotic (partial coagulase positive)
wop(h)
gpccl

Question 8

Micrococcus

Answer 8

Found in envrionment - indigenous skin flora
G pos cocci
resemble CNS
yel, pk (pigmented)
gpc tetrads

Question 9

Rothia mucilaginosa

Answer 9

Encapsulated G pos cocci (clusters, tetrads)
Grey-white colonies
Sticky staph - adhere to agar
Normal flora of oral cavity, rarely opportunistic
gy, wt
gpccl