Bubonic plague is an infectious disease caused by the bacterium Yersinia pestis. It is the most common form of plague and is typically transmitted to humans through the bites of infected fleas carried by rodents. The disease is characterized by painful, swollen lymph nodes known as buboes, usually found in the groin, armpits, or neck, along with symptoms such as fever, chills, and weakness. If untreated, the infection can spread to the bloodstream or lungs and become life-threatening.
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