- Bacteria
- Acetobacter
- Actinobacillus
- Actinomycetales
- Aeromonas
- Alcaligenes
- Arthrobacter
- Azotobacteriaceae
- Bacillaceae
- Bacteroidaceae
- Bordetella
- Brevibacterium
- Brochothrix
- Brucella
- Carnobacterium
- Cellulomonas
- Chlamydia
- Clavibacter
- Corynebacterium
- Cytophagales
- Enterobacteriaceae
- Erysipelothrix
- Flavobacterium
- Francisella
- Haemophilus
- Lactobacillus
- Lawsonia (bacteria)
- Legionella
- Listeria
- Megasphaera
- Methanobacteriaceae
- Micrococcaceae
- Mycoplasmatales
- Neisseriaceae
- Nitrobacter
- Nitrosomonas
- Ornithobacterium
- Paracoccus
- Pasteurella
- Pasteuria
- Peptococcaceae
- Plesiomonas
- Propionibacterium
- Pseudomonaceae
- Ralstonia
- Rhizobiaceae
- Rhodobacter
- Rhodopseudomonas
- Rickettsiales
- Selenomonas
- Spirillaceae
- Spirochaetales
- Streptobacillus
- Streptococcaceae
- Taylorella
- Vibrio
- Xylella
- Zymomonas