Streptococci/Enterococcicontinued Clinical Microbiology Review 164
ORGANISM PATHOGENICITY GRAM STAIN COLONIES ON SBA KEY CHARACTERISTICS OTHER
Microaerophilic
Streptococcus spp
(formerly
S. millerigroup)
3 species: S. anginosus,
S. constellatus, S. inter-
medius. In viridans
group. Require 10%
CO 2. Grow better
anaerobically.
GPC in pairs, chains Colonies are half
the size of other
strep. Usually beta
hemolytic but can
be alpha hemolytic
or nonhemolytic.
Butterscotch or
caramel odor.
Normal flora of
mouth & GI, GU
tracts. Infections
associated with
trauma or surgery.
Most common
sites: abdomen,
head, neck
Usually Lancefield
group F. PYR neg.
VP pos
