Classification of bacteria according to oxygen requirement
Gram stain |
Obligate aerobes or facultative anaerobes |
Obligate anaerobes |
Positive |
Micrococcus spp.
Staphylococcus spp.
Streptococcus spp.
Enterococcus spp.
Listeria spp.
Bacillus spp. |
Peptostreptococcus spp.
Actinomyces israelii
Clostridium spp.
Propionibacterium spp. |
Negative |
Neisseria spp.
Escherichia spp.
Klebsiella spp.
Enterobacter spp.
Pseudomonas spp. |
Veillonella spp.
Bacterioides spp.
Fusobacterium spp. |