CausesBy Mayo Clinic staff
The plague bacteria, Yersinia pestis, is transmitted to humans when they are bitten by fleas that have previously fed on infected animals, such as:
- Prairie dogs
The bacteria can also enter your body if you have a break in your skin that comes into contact with an infected animal's blood. Domestic cats can become infected with plague from flea bites or from eating infected rodents.
Pneumonic plague, which affects the lungs, is spread by inhaling infectious droplets coughed into the air by a sick animal or person.
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