The primary host of the cat flea is the domestic cat. The cat flea is also the primary flea infesting dogs in most of the world. It can also maintain its life cycle on other carnivores. Humans can be bitten but they cannot be infested. The female cat flea lays her eggs on the host. The eggs, once dry, filter out of the haircoat of the host into the resting area of the host. Cat fleas can transmit other parasites and infections to dogs, cats and humans. The most prominent of these are Bartonella, murine typhus, and apedermatitis.