People can get bitten by fleas, but it is not common for a human to be infested with fleas in the same way that dogs and cats can be. Fleas need a lot of hair and fur in order to hide, reproduce, and lay their eggs, so animals tend to be a more suitable host.
In most cases, people get bitten by cat or dog fleas whose primary host is their pet, but will bite a human if the opportunity presents itself to them.
In order to prevent flea bites, people can topically apply a variety of flea repellents to their skin. Many people prefer to craft their own homemade flea repellents from all-natural oils such as tea tree oil or cedar oil.
The best way for a person to prevent getting bitten by fleas, however, is really to get their pets on a suitable flea medication such as Frontline. By eliminating the host as a viable food source, you will successfully kill flea infestation and be flea free for the long-term.