TIM VERNON / SCIENCE PHOTO LIBRARY TIM VERNON / SCIENCE PHOTO LIBRARY
Animation of a Yersinia pestis bacterium, the causative agent of plague. It is a Gram-negative non-motile rod-shaped bacterium, commonly found in rodents and spread by the bites of their fleas. Infected flea bites can also transmit the disease to humans. In the past this has caused huge pandemics, such as the Black Death in the mid-14th century, in which a third of the population of Europe was killed.
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