Gram Positive

Bacterial Morphology Probable Organisms
  • Cocci in clusters/clumps
Staphylococcus spp
Micrococcus/Macrococcus spp
Pediococcus spp
Aerococcus spp
  • Cocci in pairs/chains
Streptococcus spp
Gemella spp
Enterococcus spp
Anaerobic cocci
  • Bacilli (small) non spore forming
Listeria spp
Corynebacterium spp
Erysipelothrix spp
Propionibacterium spp
Actinomyces spp
Other anaerobic bacilli
  • Bacilli (large) +/- spores
Clostridium spp
Bacillus spp
Lactobacillus spp
  • Bacilli branching/ beaded/filamentous
Nocardia spp
Actinomyces spp
Streptomyces spp