Bubonic plague is most commonly transmitted to humans through the bite of infected fleas, particularly fleas that live on rodents such as rats. When a flea feeds on an infected animal, it can become a carrier of the bacterium Yersinia pestis, which causes bubonic plague. The flea can then transmit the bacteria to humans during later bites. Humans may also become infected through direct contact with contaminated animal tissues or bodily fluids, or through scratches and bites from infected animals, including domestic cats.
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