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Lice of Cats

By Karen A. Moriello, DVM, DACVD, Professor of Dermatology, Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison
Thomas R. Klei, PhD, Boyd Professor and Associate Dean for Research and Advanced Studies, School of Veterinary Medicine and Louisiana Agriculture Experiment Station, Louisiana State University
David Stiller, MS, PhD, Research Entomologist, Animal Disease Research Unit, U.S. Department of Agriculture, Agricultural Research Service, University of Idaho
Stephen D. White, DVM, DACVD, Professor and Chief of Service, Dermatology, Veterinary Medical Teaching Hospital; Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis
Michael W. Dryden, DVM, PhD, DACVM, University Distinguished Professor of Veterinary Parasitology, College of Veterinary Medicine, Kansas State University
Carol S. Foil, DVM, MS, DACVD, Professor, Department of Veterinary Clinical Sciences, School of Veterinary Medicine
Paul Gibbs, BVSc, PhD, FRCVS, Professor Emeritus, College of Veterinary Medicine, University of Florida
John E. Lloyd, BS, PhD, Professor Emeritus of Entomology, University of Wyoming
Bernard Mignon, DVM, PhD, DEVPC, Assistant Professor, Faculty of Veterinary Medicine, Department of Infectious and Parasitic Diseases, Parasitology and Parasitic Diseases, University of Liège
Wayne Rosenkrantz, DVM, DACVD,
Patricia A. Talcott, MS, DVM, PhD, DABVT, Associate Professor, Department of Food Science and Toxicology, Holm Research Center, University of Idaho
Alice E. Villalobos, DVM, DPNAP, Director; Director, Animal Oncology Consultation Service; Pawspice
Patricia D. White, DVM, MS, DACVD,

Also see professional content regarding lice.

Lice are small, flightless insects that live in the hair or feathers of animals and people. Most lice are of the biting or chewing type (order Mallophaga), including the cat louse (Felicola subrostrata). Lice are most often seen on older, longhaired cats that are no longer able to groom themselves.

Lice live within the environment provided by the skin and hair. They move from host to host by direct contact. In temperate regions, lice are most common during the colder months and hard to find in the summer. Most Mallophaga lice have definite preferences as to their hosts: they will often live on only one species or several closely related species.

Lice have claws on their legs that are adapted for clinging to hair. Females glue their eggs, known as nits, to the hairs of the host near the skin. The nits are tightly attached and ordinary shampooing will not dislodge them. It takes about 3 to 4 weeks for most lice to go from nit to adult.

The first signs that your cat may have lice are scratching, biting, and rubbing of infested areas. If the lice are abundant, the hair might also be matted. Usually, diagnosis is made by seeing lice on the infested cat. Parting the hair often reveals the lice. Lice are active and can be seen moving through the hair.

Using a fine-toothed comb to dislodge nits is a tedious process that will not kill lice that have hatched. Cats and other pets are more frequently treated with dips, washes, sprays, or dusts that kill lice. Your veterinarian can recommend an appropriate control product for your pet and provide directions for its use (Veterinary.heading on page Lice of Dogs).

Lice and nits may be seen when the fur is parted.

The lice that infest cats and other pets are not normally attracted to humans. Therefore, while care in dealing with the lice infesting your pet is recommended, owners should understand that people rarely get lice from their pets.

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