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Head louse egg (nit) attached to hair shaft of host. Like most insects, head lice are oviparous. Females lay about three or four eggs per day. Louse eggs (also known as nits), are attached near the base of a host hair shaft. [11] [12] Eggs are usually laid on the base of the hair, 3–5 mm off the scalp surface.
Females get head lice twice as often as males, [46] and infestation in persons of Afro-Caribbean or other black descent could be rare due to difference in hair shape or width. [46] [49] But these children may have nits that hatch and the live lice could be transferred by head contact to other children. [50]
The life cycle of the body louse consists of three stages: egg, nymph, and adult. Eggs (also called nits, see head louse nits) are attached to the clothes or hairs by the female louse, using a secretion of the accessory glands that holds the egg in place until it hatches, while the nits (empty egg shells) may remain for months on the clothing ...
The life cycle is completed in about 5 weeks. [8] H. suis are hemimetabolous (gradual metamorphosis). The metamorphosis of hog lice includes 3 nymphal instars. [7] Once hatched, young lice molt and move to tender areas of the body to feed. Nymphs tend to remain concentrated near the head region. After 10 days, the lice are sexually mature and ...
The Center for Disease Control (CDC) estimates that six to twelve million infestations occur each year among children ages 3 to 11, and although head lice are not known to spread disease, the ...
Mallophaga develop by gradual metamorphosis. Females typically lay 150–300 eggs over an interval of 2–3 weeks. The eggs, commonly known as nits, are oblong and around 1 mm long. The eggs are glued to the hairs or feathers of the host with a secretion from the female accessory glands.
From each egg or "nit" may hatch one nymph that will grow and develop to the adult louse. Lice feed on blood once or more often each day by piercing the skin with their tiny needle-like mouthparts. While feeding they excrete saliva, which irritates the skin and causes itching. [8] Lice cannot burrow into the skin. [citation needed]
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