Fleas can carry infectious diseases from animals, and their bites can transfer these diseases to humans. The Public Health Department of Seattle and King County states that a flea bite does not necessarily mean a person will get sick, but some of the diseases fleas transmit can be deadly.
The Public Health Department of Seattle and King County states that a flea bite can cause serious itching and possibly skin infection, but there is also a risk of the transmission of deadly diseases. Fleas that live on dogs, cats, and other furry animals can cause typhus, cat-scratch fever and plague in humans. Fleas can be killed with various insecticides and insecticide shampoos.