Joseph Berger
Fleas
General Description
Fleas are typically reddish-brown and about one-eighth of an inch long. The body is flattened from side to side
and it has long claws on its legs - both are adaptations for traveling between hair shafts. Some fleas also have
spines on their mouths, legs and backs to help prevent them from being groomed off. Cat fleas (Ctenocephalides
felis) are more common on cats, dogs and humans than dog fleas (Ctenocephalides canis) and human fleas (Pulex
irritans). Each has a preferred host. The human flea prefers the blood of humans and pigs. Cat and dog fleas
prefer cats and dogs, though children can become bitten when sleeping or resting with pets. Other flea
species occasionally encountered by humans include the Oriental rat flea (Xenopsylla cheopis) and the northern
rat flea (Nosopsyllus fasciatus). These fleas live on Norway rats and roof rats, and are capable of transmitting
plague and murine typhus to humans.
General Control
Knowing the flea’s life cycle is critical to successful management of flea infestations. Control measures should
focus on where fleas are found and where they are suspected to be. Adult fleas are found on their hosts, so pets
should be treated. Newly emerged adult fleas, flea pupae and larvae, are found where infested animals rest and
sleep. These should be washed regularly and carpeting, rugs and furniture should be vacuumed thoroughly and
frequently. Promptly dispose of vacuum contents in a sealable container such as a plastic bag. After vacuuming
and cleaning, pesticides labeled for flea control can be applied as spot treatments. Flea problems can be
challenging. Complete control requires knowledge, attention to detail and perseverance. Those unwilling or
unable to conduct a complete flea prevention effort should consider hiring a pest management professional.