Which of the following is a reservoir for Yersiniosis?

Yersiniosis is primarily caused by the bacterium Yersinia enterocolitica, which is often associated with specific reservoirs. Humans are a significant reservoir for this pathogen because it can be transmitted from person to person, particularly in settings where hygiene is poor or contaminated food is consumed.

While the other options can be associated with Yersinia species (like Yersinia pestis in the case of plague), they are not the primary reservoirs for Yersiniosis itself. Cats and fish are not typically linked to outbreaks or cases of Yersiniosis, and while rabbits can carry Yersinia, they are not the main concern for this specific illness. Therefore, humans being a documented reservoir highlights their role in the transmission and spread of Yersiniosis, making this the most accurate answer in the context of the question.