Yersinia pestis

Yersinia pestis is a bacterium that causes plague, a serious infectious disease. It is primarily transmitted to humans through bites from infected fleas or contact with infected animals. Plague can manifest in different forms, including bubonic plague, characterized by swollen lymph nodes, and pneumonia, which affects the lungs. Historically, plague caused widespread pandemics, such as the Black Death in the 14th century. Today, while rare, it still exists in some regions and can be effectively treated with antibiotics if caught early. Public health measures and monitoring help prevent outbreaks and control its spread.