are brown head lice eggs dead?
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Nits frequently are seen on hair behind the ears and near the back of the neck. Nits that are attached more than ¼ inch from the base of the hair shaft are almost always non-viable (hatched or dead).
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Pyrethrins can only kill live lice, not unhatched eggs (nits). A second treatment is recommended 9 to 10 days after the first treatment to kill any newly hatched lice before they can produce new eggs.
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Lice often appear to be the same color as the hair they've infested, making them hard to see with the naked eye. ... Lice eggs (called nits) are oval in shape. They may appear to be the color of their host's hair, ranging from white to yellow to brown.
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Although lice and their nits are small, they are visible to the naked eye. Head lice can be white, brown, or dark gray.
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Lifespan of Lice Nits (eggs) that are over ½ inch (1 cm) from the scalp are empty egg cases. They are very white in color. Off the scalp, nits (eggs) can't survive over 2 weeks.
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Head lice nits usually take about 8–9 days to hatch. Eggs that are likely to hatch are usually located no more than ¼ inch from the base of the hair shaft. Nits located further than ¼ inch from the base of hair shaft may very well be already hatched, non-viable nits, or empty nits or casings.
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However, research has shown that a fine toothed plastic detection comb is better for finding live head lice as the teeth are rigid enough to catch the smallest of lice. Metal combs tend to be more effective at removing the nits and hatched white egg cases that are often stuck to the hair shaft.
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Head lice usually stay close to the scalp and behind the ears. You might also spot them on the eyebrows and eyelashes. Female adult lice lay six to eight eggs a day on your scalp, and they spread from there.
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*New generations of lice are becoming resistant to many of the chemicals in the over the counter treatments. Many of these treatments have a certain success in killing the hatched bugs, but not their eggs. The survival of such eggs makes the re-infestation a common problem.
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Head lice eggs are oval, and the size of a pinhead. They are firmly attached to the hair shaft and cannot be brushed off. (A live egg will make a 'pop' sound if you crush it between your fingernails.)
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Head lice and eggs do not survive long away from the human scalp, as they are human parasites. It is not necessary to wash all the household linen or clothing, to vacuum, scrub or spray the house with insecticide, or to treat the dog or cat.
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Lice are tiny, but you can still see them — though it's not always easy. An adult louse is grayish white or tan and about the size of a small sesame seed. Lice move fast, so you're actually more likely to see their eggs than the lice themselves.
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Lice cannot survive, off-head, more than 24 hours. Lice cannot survive extreme heat or cold temperatures. Lice can hold their teeny little breath for up to 8 hours. Lice have short legs with claws at the end that allow them to expertly hang on to the hair shaft - even in wind, the pool, and during hair washing.
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Lice eggs (nits). Unless a child has many head lice, it's more common to see nits in the hair than live lice crawling on the scalp. Lice eggs hatch 1–2 weeks after they're laid. After hatching, the remaining shell looks white or clear and stays attached to the hair shaft.
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When they are alive, nits are firmly attached to the hair follicle close to the scalp. When treating head lice, it may be difficult to tell whether the nit is still alive or if it has hatched. The simplest way to tell is by looking at the color — live and dead nits are brown while hatched nits are clear.
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It may take a few days for the itching to stop, and the treatment may need to be repeated in 7 to 10 days to make sure any surviving lice are killed before they produce new eggs. Sometimes, adults choose to skip the medicated shampoo and only use a fine-toothed comb to remove the lice and nits from the hair.
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The entire life cycle requires about 21 to 27 days. The adult body louse can survive no longer than eight to ten days off the host, and all stages, including eggs, die within 30 days away from the host. Under normal conditions the eggs will hatch in about a week.