What causes Yersinia enterocolitica food poisoning?

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Yersinia enterocolitica food poisoning is caused by the ingestion of food that is contaminated with the organism for which it is named. Y. enterocolitica may be found in water that has not been treated, soil, and various animals including squirrels, beavers, and pigs. The bacteria may pass on to humans through a number of means, including dirty water and the consumption of pork or other types of meat that have not been thoroughly cooked. In unsanitary conditions, the bacteria can travel from person to person through the fecal-oral route. This less common form of transmission involves the transfer of bacterium from the fecal matter of one person to the oral cavity of another through the preparation of food with unclean hands.