<human>:  What was the name of the disease that caused the Great Plague of London?
<bot>: The Great Plague of London was caused by a bacterium called Yersinia pestis. The bacteria is spread through fleas and rats, which can then infect humans. Symptoms of the plague include fever, chills, and coughing. The symptoms of the plague are similar to the flu, and so it is very difficult to diagnose. The plague killed tens of thousands of people in London in the 1660s.