The Black Death.

- Fleas bit infected rats.
- When an infected flea beat a human, it became infected (the blood).
- Symptoms:
 · Swellings on necks and armpits.
 · Black or purple spots on other parts of the body, as the nose or tips of fingers.
- 3 types of plagues:
 · Bubonic plague, spread from flea bites. One week of life.
 · Pneumatic plague, attacked the respiratory system and spread by breathing. 2 days of life.
 · A rares version attacked the blood system.
- Consequences:
 · Black death killed at least 75 million people in Europe alone.
 · Historians said it killed as many as 150 million people, 60% of the European population.