Plague bacteria


Bacteria: Burcellaceae: Yersinia spec. The cause of bubonic plague (the Black Dead of the Middle Ages) is yersinia pestis. The yersinia- bacteria are rod-shaped, non-motile, Gram-negative bacilli. Yersinia pestis is primarily carried by the fleas of rats. Transfer to humans occures when such fleas feed on human blood. Infection is rapid, causing swollen lymph nodes and leading to septicaemia and pulmonary infection. Extensive control measures against rats and their fleas have elliminated the plague from Europe, but it still occurs in other regions of the world.

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