This photograph of a flea was taken during a 1972 study of disease carriers, and pests of migrant labor camps.
Humans can contract plague, Y. pestis, when bitten by a rodent flea that is carrying the plague bacterium, or by handling an infected animal. “Murine” typhus, due to Rickettsia typhi bacteria, can also be transmitted by rodent fleas to man.
from CDC Public Health Image Library