Why did the plague spread to other people?

The plague is a disease that can be spread from person to person through close contact with an infected person or animal, or through contact with contaminated surfaces or objects. Plague is caused by the bacterium _Yersinia pestis_, which is usually transmitted to humans through the bites of infected fleas. The plague spread to other people because of:

- Poor sanitation: In medieval times, people did not have access to clean water and sanitation, which allowed the plague to spread easily.

- Overcrowding: People lived in close quarters, making it easier for the plague to spread from person to person.

- Lack of medical knowledge: People did not understand how the plague was spread, which made it difficult to prevent and treat.

- Travel and trade: The plague was spread along trade routes by merchants, travelers, and pilgrims.