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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 ]
Aside from reproduction, nymph behavior is similar to the adult. Like adults, nymphs feed also only on human blood (hematophagia), and cannot survive long away from a host. [1] Outside their hosts lice cannot survive more than 24 hrs. [23] The time required for head lice to complete their nymph development to the imago lasts for 12–15 days. [1]
"Most active lice and nits are removed in the first round of topical treatments, though 20% to 30% can survive the initial treatment." Anyone can get lice. According to CDC data, an estimated 6 ...
Adults can live for about thirty days, but if they are separated from their host they will die within two days. [12] If the conditions are favorable, the body louse can reproduce rapidly. After the final molt, female and male lice will mate immediately. A female louse can lay up to 200–300 eggs during her lifetime. [13]
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.
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.
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