— E. coli
Pink to red colonies
Virulent strains cause gastroenteritis, urinary tract infections etc.
Common in lower intestine.
— Micrococcus luteus
Egg yolk / raised yellow circles
Part of the normal flora of the skin, also found in respiratory tract - saliva and sweat
— Bacillus Subtilis
White, spread out like flat cauliflower florets, gaining dimension over time
Found in soil and gastrointestinal tract of humans
— Streptococcus agalactiae (aka GBS)
Light blue pin-like small colonies
Generally harmless, part of human microbiota
— Enterococcus spp.
Blue to turquoise pinpoint colonies.
Bacteremia, urinary tract infections, diverticulitis
— Proteus mirabilis
Clear to slightly orange colonies, appear layered and spread out in discs
Kidney stones and 90% of all proteus infections in humans
— Proteus vulgaris
Small blue / green colonies
Found in soil, water, fecal matter - causes wound infections, urinary tract infections
— Pseudomonas aeruginosa
Transparent white to slightly green colonies with some diffusion into media. Some species may be tan to reddish brown.
Normal flora, found in skin, water, most man-made environments globally
— Serratia marcescens
Bathroom slime / leading cause of hospital acquired infections
— Staphylococcus aureus
White to light yellow colonies; some species may appear mauve
Common cause of skin infections, sinusitis and food poisoning
— Staphylococcus intermedius
Pink pinpoint colonies.
— Molds / yeast colonies
Fuzzy / furry white
Typically from decaying organic matter or food