| 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) | |
The Black death, a bubonic plague during the Middle ages caused by the bacterium Yersinia pestis, killed 30%-60%of Europeans (80%of people in the south of France and Spain) and reduced global population from 450 million to around 350 million.
Consumer Reports released a study last month that found the bacteria Yersinia enterocolitica in 69 percent of 198 pork chop
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