* Yersinia pestis: This is the most well-known *Yersinia* species, causing plague, a serious infectious disease. It is transmitted by fleas.
* Yersinia enterocolitica: This species causes yersiniosis, a foodborne illness that primarily affects the gastrointestinal tract. It is commonly found in pork and other animal products.
* Yersinia pseudotuberculosis: This species is also a cause of yersiniosis, though it is less common than *Y. enterocolitica*. It is found in a variety of animals, including rodents.
It's important to note that:
* Not all *Yersinia* species cause disease in humans.
* While *Y. pestis* is the only species that causes plague, *Y. enterocolitica* and *Y. pseudotuberculosis* can both cause yersiniosis.
* There is no single "sub-type" responsible for yersiniosis, as it is caused by two different *Yersinia* species.
