Whether the early forms of Yersinia pestis caused symptoms as severe as those in the Middle Ages is still unknown. But how ...

Symptoms usually appear within one to seven ... Usually, people get the plague after being bitten by a rodent flea carrying Yersinia pestis, the bacterium that causes the disease, or by handling ...

Yet the highly infectious disease borne of the bacterium Yersinia pestis still persists ... has first feasted on an infected rodent. Initial symptoms — sudden fever, headache, muscle pain ...

Evidence from 13th-century chroniclers and physicians indicates plague may have been involved in epidemics a century before the Black Death, a new study shows.

These symptoms require immediate medical attention ... Fleas can transmit diseases such as typhus and Yersinia pestis. Horsefly bites may take a long time to heal because the insect cuts into ...

Yersinia pestis, the bacterium that causes plague ... In this study they show how close examination of the symptoms described suggested that this was indeed the disease now known to be caused ...