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Yersiniosis (Yersinia species). Yersiniosis is an infectious disease caused by enteric bacteria of the genus Yersinia. In the United States, most human illness is caused by one species, Y. enterocolitica.Y. enterocolitica is a relatively infrequent cause of diarrhea and abdominal pain.1  Causes and Symptoms of Yersiniosis Yersinia enterocolitica facts, including common symptoms and how the disease is spread.ersiniosis (Yersinia species). Yersiniosis is an infectious disease caused by enteric bacteria of the genus Yersinia. In the United States, most human illness is caused by one species, Y. enterocolitica.
Yersinia pestis: The bacteria that causes the bubonic plague which in the year 541 (as the Black Death) and later in the Middle Ages decimated Europe. The effects of the plague are described in the nursery rhyme We all fall down.. Y. pestis mainly infects rats and other rodents which are the prime reservoir for the bacteria. Fleas are the prime vectors carrying the bacteria from one species to another. They bite rodents infected with Y. pestis, then they bite people and so transmit the disease to them. Transmission of the plague to people can also occur from eating infected animals such as squirrels. Once someone has the plague, they can transmit it to another person via aerosol droplets.