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Head lice are spread by direct contact with the hair of someone who is infected. [4] The cause of head lice infestations in children is not related to cleanliness. [5] Other animals, such as cats and dogs, do not play a role in transmission. [4] Head lice feed only on human blood and are only able to survive on human head hair.
Head lice cannot fly, and their short, stumpy legs render them incapable of jumping, or even walking efficiently on flat surfaces. [ 2 ] The non-disease-carrying head louse differs from the related disease-carrying body louse ( Pediculus humanus humanus ) in preferring to attach eggs to scalp hair rather than to clothing.
Trichodectes canis, also known as canine chewing louse, is a chewing louse found on domesticated dogs and wild canids throughout the world. T. canis is a well-known vector for the dog tapeworm, Dipylidium caninum. T. canis usually does not present any major problems to the host, however, can be very irritating in heavy infestations.
Head lice are most common among young children — 6 million to 12 million lice outbreaks occur yearly in children between 3 and 11 in the US — though adults are vulnerable to head lice as well.
Head lice are about 2 to 3 millimeters long, and they usually infest the head or neck and attach their eggs to the base of the hair shaft, according to the CDC.
The itchiness, irritation, and the incessant scratching caused by the small bugs on your scalp and hair make head lice a nuisance at best and at worst, well—they’re the worst. Head lice feed ...