What caused the Plague?

This disease started in the weirdest way EVER! The disease started by rat fleas, believe it or not. A complex bacterial strain called Yersinia Pests lives in the digestive system of rat fleas, but this bacteria can also live in human fleas too. The Y. Pests could not pass through healthy skin. So the Pests broke the skin... and began to feed.

People back then didn't know what was causing the plague. They thought it was god blaming them for their sins. The government blamed citizens for leaving trash and dead animals to rot on the city streets. Doctors believed that dangerous planets like Mars, Jupiter, and Saturn were to blame. A lot believed that the Jewish were to blame. Because of this, many Jews were murdered. Jerks.