Cat fleas are not choosy - a human being is as tasty a snack as any cat.
Some people suffer an allergic response if bitten by a flea, reacting against the animals saliva.
Flea debris can also cause watery eyes and itching in humans. The cat flea is now the most common domestic flea species. Modern Living Fitted carpets have been installed in homes and are no longer taken outside in the springtime for a good beating over the washing line - this one fact holds some of the blame for the upsurge in activity. Central heating which activates the flea pupae can also keep the house perpetually infested to some degree. Vacuum cleaners vary markedly in their effectiveness and shampooing the carpet merely results in cleaner fleas.