| Acetobacteraceae (2) |  |
| Anaplasmataceae (1) | |
| Bacteroidaceae (8) | |
| Bartonella (8) | |
| Brucella (7) | |
| Campylobacter (27) | |
| Chlamydiales (3) | |
| Enterobacteriaceae (5) | |
| Escherichia (196) | |
| Gram-negative bacteria (3) | |
| Helicobacter (3) | |
| Klebsiella (3) | |
| Pasteurella (1) | |
| Proteus (5) | |
| Pseudomonadaceae (41) | |
| Pseudomonadales (1) | |
| Rhizobiaceae (13) | |
| Rickettsieae (2) | |
| Salmonella (106) | |
| Serratia (1) | |
| Shigella (2) | |
| Veillonellaceae (1) | |
| Vibrio (2) | |
| Xenorhabdus (2) | |
| Zymomona (1) | |