Pathogenics and Immunity
In the urban and sylvatic (forest) cycles of Y. pestis, most of the spreading occurs between rodents and fleas. In the sylvatic cycle, the rodent is wild, but, in the urban cycle, the rodent is domestic. In addition, Y. pestis can spread from the urban environment and back. Every infected animal can transmit the infection to humans through contact with skin tissue. Humans can also spread the bacteria to other humans through sneezing, coughing, or direct contact with infected tissue.
Read more about this topic: Yersinia Pestis
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