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Head lice infestation, also known as pediculosis capitis, is the infection of the head hair and scalp by the head louse (Pediculus humanus capitis). [6] Itching from lice bites is common. [ 5 ] During a person's first infection, the itch may not develop for up to six weeks. [ 5 ]
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.
Human head and body lice occupy distinct ecological zones: head lice live and feed on the scalp, while body lice live on clothing and feed on the body. Because body lice require clothing to survive, the divergence of head and body lice from their common ancestor provides an estimate of the date of introduction of clothing in human evolutionary ...
Head lice feed on blood several times each day and tend to reside close to your scalp, which explains the itchiness and why it’s sometimes so difficult to tell that you have head lice. Unlike ...
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 have been a dreaded parasite for years, with some schools temporarily shutting down over lice outbreaks. But while many schools and day care facilities have a policy that someone with ...
However, domesticated dogs do not usually build up these large infestations. T. canis has several adaptations that better suit it to being a permanent parasite. The females' modified legs, mandibles, and abdominal appendages allow them to grip to fur easily. T. canis tend to move much slower than human lice, and may appear almost motionless.
Head lice have been constant, if unwanted, human companions. The parasites are rich sources of genetic information illuminating big questions in the human story.
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