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[Stockbild] False colour scanning electron micrograph (SEM) of Yersinia pestis, a species of Gram negative, non-motile, capsulated, aerobic bacilli (oval/rod-shaped Bacteria) that is the causative agent of bubonic plague (the Black Death of the Middel Ages) in humans. The bacteria are primarily flea-carried pathogens of rats. Transfer to man occurs when a flea is obliged to leave its dead rodent host (often because its feeding apparatus is blocked by multiplying bacteria and it is starving) and suck human blood. The Infection is rapid, featuring swelling (bubo) of lymph nodes and leading to septicaemina and pulmonary infection, undated picture. (KEYSTONE/Science Photo Library/Cnri/Str) === , STOCK ===