Quick Review Cards for Medical Laboratory Science

Staphylococcicontinued Clinical Microbiology Review 159

ORGANISM PATHOGENICITY GRAM STAIN COLONIES ON SBA KEY CHARACTERISTICS OTHER

S. saprophyticus

Micrococcus

UTI = urinary tract infection.

Novobiocin only

performed when CNS

isolated from urine of

female.

Not commonly iso-

lated. Must differenti-

ate from staph.

Usually only grow

aerobically.

GPC, usually in

clusters

Large GPC in

pairs, tetrads

(predominant

arrangement),

clusters

White to slightly

yellow. Non-

hemolytic.

Often pigmented

(bright yellow,

orange, pink, tan).

High-domed

colonies.

UTI in young sexu-

ally active females,

urethritis & prosta-

titis in males

Usually nonpatho-

genic. Found in

environment &

on skin, mucous

membranes,

oropharynx

Coagulase neg. Resistant

to novobiocin. May

ferment mannitol.

Catalase pos. Coagulase

neg. Oxidative.

Microdase (modified

oxidase) pos. Suscepti-

ble to bacitracin. Resis-

tant to furazolidone &

lysostaphin.