microbiology colony morphology and gram stain

staphylococcus

gram positive cocci in clusters

streptococcus

gram positive cocci in chains

streptococcus pneumoniae

gram positive

diplococci

corynebacterium

gram positive

bacilli

Chinese letters

lactobacillus

gram positive

chains, pairs

bacillus

gram positive

bacilli

chains / pairs

some spores inside

clostridium

gram positive

bacilli

q - tip shaped

radom arrangement

nocardia / streptomyces

gram postive

bacilli

branching / filamentous

candida

black / deep purple

large ovals, some budding

crytococcus

purple

large, round, no pseudohyae

Escherichia coli

gram - negative

bacilli

random arrangement

vibrio

gram - negative

bacilli

random arrangement

comma shaped

haemophilus

gram negative

coccobacilli

random arrangement

campylobacter

gram - negative

room arrangement

seagull

neisseria / moraxella

gram - negative

diplococci

gardnerella vaginalis

gram - variable

bacilli

random arrangement

staphylococcus aureus

beta

opaque

medium colony size

glistening surface, smooth edges

coagulase - negative staphylococcus / staphylococcus epidermidi

gamma

white / cream

opaque

small / medium

smooth edges

micrococcus

gamma

lemon yellow

opaque

medium

smooth edges

rothia mucilaginosa

gamma

white / grey

opaque

medium

smooth edges

sticky / gummy surface

Group A Streptococcus:

Streptococcus pyogenes

beta, wide zone

gray

transparent

small

smooth edges

Group B Streptococcus (Streptococcus agalactiae)

beta, narrow zone

gray

translucent

medium

smooth edges

enterococcus

gamma

grey

opaque / slightly translucent

makes agar darken / green tint

streptococcus pneumoniae

alpha

green / grey

small medium

donut or mucoid

viridians streptococcus

alpha

grey / green

tiny / small

domed / raised

water drops

Corynebacterium

gamma

white

opaque

medium

dry to creamy

lactobacillus

alpha

grey / green

tiny

right / irregular edges

bacillus cereus

beta

grey

opaque

large

ground / frosted glass texture

listeria monocytogenes

identical to group b strep

nocardia / streptomyces

gamma

white / tan / cream

opaque

dry / chalky

musty / dirt smell

pathogenic neisseria on CHOC

gamma

does not grow on BAP

medium

smooth edges / glistening

mortadella catarrhalis

gamma

white / grey

opaque

small

hockey puck

haemophilus

CHOC only

tan / grey

small / medium

e coli

beta

opaque

wet / irregular edges

Pseudomonas aeruginosa

beta

gray

medium / large

metallic / oil

Klebsiella pneumoniae

gamma

yellow - grey

medium large

wet muciods

Serratia marcescens

PINK

gamma

medium / large

wet . glistening

Proteus species

gamma

grey

swarm wave like

Candida albicans (Yeast)

gamma

white / cream

opaque

small

feets

Cryptococcus neoformans (Yeast)

gamma

gray

mucoid