how long can you go without knowing you have lice?
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However, you may not feel itchy right away, especially if it's a light infestation. You may not notice any symptoms for up to six weeks the first time you get lice.
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Head lice survive less than 1–2 days if they fall off a person and cannot feed; nits cannot hatch and usually die within a week if they are not kept at the same temperature as that found close to the human scalp.
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Catching Head Lice in Your Car Lice can survive for only a couple of days without a human host. ... Just as they can fall off an infested person in the house when they're sitting on the couch or laying on a pillow, they can also fall off while they're in the car.
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It's important to follow this advice. Some treatments only need to be applied to the affected area, but sometimes the whole body must be treated, taking care to avoid the eyes. The treatment usually needs to be repeated 7 days later to get rid of any lice that have hatched during that time.
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It all depends on what your doctor thinks will work best for you. Lice can be hard to get rid of. If you still have lice 2 weeks after you started treatment, let your doctor know. Your doctor may want to try a different medication or repeat treatment in case any nits were left behind and hatched after treatment.
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Three forms of head lice exist: nits, nymphs, and mature adults. Nits are lice eggs that attach to the hair shaft and usually hatch within a week.
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Females are usually larger than males and can lay up to 8 nits per day. Adult lice can live up to 30 days on a person's head. To live, adult lice need to feed on blood several times daily.
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Adult lice and nymphs (baby lice). Nymphs are smaller and become adult lice about 1–2 weeks after they hatch. This life cycle repeats itself about every 3 weeks. Most lice feed on blood several times a day, and they can survive up to 2 days off the scalp.
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The eggs of a louse, also called nits, must also be killed. Nits will hatch after about 7-10 days and must be removed. Using a product such as Nix® Crème Rinse, which provides a residue for up to 14 days, can help eliminate the newly hatched nits.
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Do not use a combination shampoo/conditioner, or conditioner before using lice medicine. Do not re–wash the hair for 1–2 days after the lice medicine is removed.
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Don't Obsess Over Nits “A good rule of thumb is this: If no live crawling insects are seen three weeks after the treatment, it's safe to assume that you are in the clear,” Dr. Cohen says. If nits were alive, they would have hatched by now. Nits and their shells may remain in the hair for some time but won't be viable.
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some nits were left behind (if you see nits far from the scalp — more than ½ inch (1 cm) — and no live lice, these are probably dead and treatment likely isn't needed) your child is still around someone who has lice.
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Head lice require regular feedings and will typically die within 24-48 hours away from a human host. Head lice have 3 stages of development: Nit, Nymph and Adult Louse. The female louse can lay about 7-10 eggs (nits) per day and lives up to 30 days on the human head.
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You do not need to use regular shampoo or conditioner after the lice treatment. In fact, it is best to not shampoo again for 2 days, in order to give the medicine time to work. The medicine will kill the live lice bugs, generally within 12 hours.
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When you are first infected with lice, it may take up to 4 weeks for the itching to begin. After that, itching will usually happen 1 to 2 days after. Some people may not have any symptoms. You may see red bumps on the scalp and small, yellowish-white oval nits, or eggs, stuck to the hair.
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Itching. The most common symptom of a lice infestation is itching on the scalp, neck and ears. This is an allergic reaction to louse bites. When a person has a lice infestation for the first time, itching may not occur for four to six weeks after infestation.
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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.