- This article is about the insect. For the musician in the band Red Hot Chili Peppers, see Flea (musician).
|SEM of a flea|
There are several types of fleas including the dog flea, cat flea, human flea, northern rat flea, and the oriental rat flea. During the Middle Ages, the oriental rat flea that spread a bacteria that caused the Bubonic Plague, also known as the Black Death or Black Plague, a huge epidemic the size of today's bird flu. The oriental rat flea would become infected by the bacteria: yersinia pestis. After infected the bacteria grew inside of the flea eventually blocking the path to their stomach. Because of this the flea was always hungry. When the flea would bite a human it opened up the skin and since the stomach of the flea was blocked, the blood from the human was heaved up back into the human, but only this time it was infected with the Bubonic plague bacteria.