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The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans. [1] Head lice are wingless insects that spend their entire lives on the human scalp and feed exclusively on human blood. [1] Humans are the only known hosts of this specific parasite, while chimpanzees and bonobos host a closely related species, Pediculus schaeffi.
Female lice are usually more common than males, and some species are parthenogenetic, with young developing from unfertilized eggs. A louse's egg is commonly called a nit. Many lice attach their eggs to their hosts' hair with specialized saliva; the saliva/hair bond is very
The location of the body louse eggs differs from that of head louse eggs. The head louse will lay eggs on hair roots, whereas a body louse will lay eggs in articles of clothing. This picture represents the louse from egg to adult and the process of going through three molts to achieve adulthood. The two P. humanus subspecies are morphologically ...
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One can recognize the presence of triatomines in a house by its feces, exuviae, eggs, and adults. Triatomines characteristically leave two kinds of feces like strikes on walls of infected houses; one is white with uric acid, and the other is dark (black) containing heme. Whitish or pinkish eggs can be seen in wall crevices.
A temperature of 130 °F (54 °C) for 5 minutes will kill most of the adults and prevent eggs from hatching. [7] Leaving the clothes unwashed, but unworn for a full week, also results in the death of lice and eggs. [5] Where this is not practical or possible, powder dusting with 10% DDT, 1% malathion or 1% permethrin is also effective. [5]
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