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Pneumonic plague, the name of a serious and potentially fatal lung infection, is one of three forms of plague, along with septicemic and bubonic plague. Pneumonic plague, which is caused by the bacteria Yersinia pestis, is frequently spread by infected rodents. Around three to seven days after exposure to the bacteria, those infected with the plague typically develop a fever, headache, chest pains, cough, and shortness of breath. According to some scholars, pneumonic plague might have been responsible for the Black Death, which killed between 75 million and 200 million people in Eurasia in the 1300s. Today, it is possible to treat pneumonic plague with antibiotics.