Septicemic plague, an infection of the blood.Pneumonic plague, an infection of the lungs.Bubonic plague, an infection of the lymph nodes.There three most common forms of plague are: But it has been known to occur in parts of California, Arizona, Colorado, and New Mexico. Today, plague is rare in the United States. It can still be found in Africa, Asia, and South America. In the Middle Ages in Europe, massive plague epidemics killed millions of people. Anyone who breathes in these particles may catch the disease. When someone with pneumonic plague coughs, tiny droplets carrying the bacteria move through the air. Plague lung infection is called pneumonic plague. In rare cases, people get the disease when handling an infected animal. People can get plague when they are bitten by a flea that carries the plague bacteria from an infected rodent. Rodents, such as rats, carry the disease. Plague is caused by the bacteria Yersinia pestis.
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