How Long Can You Have Lice and Not Know It

What are caput lice?

The head louse, or Pediculus humanus capitis, is a parasitic insect that tin be found on the caput, eyebrows, and eyelashes of people. Caput lice feed on homo blood several times a day and live close to the human scalp. Caput lice are not known to spread disease.

Who is at chance for getting head lice?

Head lice are plant worldwide. In the U.s., infestation with caput lice is most mutual amongst pre-school children attending child intendance, elementary schoolchildren, and the household members of infested children. Although reliable data on how many people in the United States become head lice each year are not bachelor, an estimated half dozen million to 12 million infestations occur each year in the United States among children iii to xi years of age. In the United States, infestation with head lice is much less mutual amid African-Americans than amongst persons of other races, maybe because the claws of the head louse constitute most frequently in the United States are ameliorate adjusted for grasping the shape and width of the hair shaft of other races.

Caput lice move by crawling; they cannot hop or wing. Head lice are spread by direct contact with the hair of an infested person. Anyone who comes in head-to-caput contact with someone who already has head lice is at greatest chance. Spread by contact with habiliment (such as hats, scarves, coats) or other personal items (such every bit combs, brushes, or towels) used past an infested person is uncommon. Personal hygiene or cleanliness in the domicile or school has zippo to do with getting head lice.

What practice head lice wait similar?

Head lice take 3 forms: the egg (besides called a nit), the nymph, and the developed.

headlice_penny

Actual size of the three lice forms compared to a penny. (CDC Photo)

nit

Analogy of egg on a hair shaft. (CDC Photograph)

Egg/Nit: Nits are lice eggs laid past the adult female caput louse at the base of the hair shaft nearest the scalp. Nits are firmly attached to the hair shaft and are oval-shaped and very modest (about the size of a knot in thread) and hard to see. Nits often appear yellow or white although live nits sometimes appear to be the same colour as the hair of the infested person. Nits are often confused with dandruff, scabs, or hair spray droplets. Head lice nits commonly take about viii–9 days to hatch. Eggs that are likely to hatch are normally located no more than than ¼ inch from the base of the pilus shaft. Nits located farther than ¼ inch from the base of operations of hair shaft may very well be already hatched, non-viable nits, or empty nits or casings. This is difficult to distinguish with the naked heart.

nymph

Nymph grade. (CDC Photo)

Nymph: A nymph is an immature louse that hatches from the nit. A nymph looks like an adult head louse, merely is smaller. To live, a nymph must feed on blood. Nymphs mature into adults about 9–12 days after hatching from the nit.

adult_louse

Adult louse. (CDC Photograph)

Developed: The fully grown and developed adult louse is about the size of a sesame seed, has six legs, and is tan to grayish-white in colour. Adult head lice may wait darker in persons with dark pilus than in persons with lite hair. To survive, adult head lice must feed on blood. An adult head louse can live about 30 days on a person'southward head merely will die inside ane or two days if it falls off a person. Adult female caput lice are usually larger than males and can lay about half dozen eggs each mean solar day.

louse claws

Adult louse claws. (CDC Photo)

Where are head lice most normally found?

Head lice and head lice nits are found near exclusively on the scalp, peculiarly around and behind the ears and near the neckline at the back of the head. Head lice or head lice nits sometimes are constitute on the eyelashes or eyebrows just this is uncommon. Head lice agree tightly to hair with claw-like claws at the end of each of their half dozen legs. Head lice nits are cemented firmly to the hair shaft and can exist difficult to remove even subsequently the nymphs hatch and empty casings remain.

What are the signs and symptoms of head lice infestation?

Tickling feeling of something moving in the hair.
Itching, caused past an allergic reaction to the bites of the caput louse.
Irritability and difficulty sleeping; caput lice are most active in the dark.
Sores on the head caused by scratching. These sores can sometimes become infected with bacteria constitute on the person's peel.

How did my child get head lice?

Caput-to-head contact with an already infested person is the most common mode to get head lice. Caput-to-head contact is common during play at school, at home, and elsewhere (sports activities, playground, slumber parties, camp).

Although uncommon, head lice tin can be spread past sharing clothing or belongings. This happens when lice crawl, or nits attached to shed pilus hatch, and get on the shared clothing or belongings. Examples include:

sharing wear (hats, scarves, coats, sports uniforms) or articles (hair ribbons, barrettes, combs, brushes, towels, stuffed animals) recently worn or used past an infested person;
or lying on a bed, couch, pillow, or carpeting that has recently been in contact with an infested person.

Dogs, cats, and other pets exercise not play a role in the spread of caput lice.

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How is head lice infestation diagnosed?

The diagnosis of a head lice infestation is best fabricated by finding a live nymph or adult louse on the scalp or hair of a person. Because nymphs and adult lice are very small, move chop-chop, and avert calorie-free, they tin be difficult to find. Use of a magnifying lens and a fine-toothed rummage may exist helpful to find live lice. If crawling lice are not seen, finding nits firmly attached within a ¼ inch of base of operations of the hair shafts strongly suggests, only does not confirm, that a person is infested and should be treated. Nits that are fastened more than ¼ inch from the base of the hair shaft are most always dead or already hatched. Nits are often dislocated with other things found in the hair such as dandruff, hair spray droplets, and dirt particles. If no live nymphs or adult lice are seen, and the merely nits establish are more than ¼-inch from the scalp, the infestation is probably old and no longer active and does not need to exist treated.

If you are not sure if a person has head lice, the diagnosis should be fabricated by their health care provider, local health section, or other person trained to identify live head lice.

How is head lice infestation treated?

More on: Treatment

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Is infestation with head lice reportable to health departments?

Well-nigh health departments exercise not require reporting of head lice infestation. However, information technology may be beneficial for the sake of others to share data with schoolhouse nurses, parents of classmates, and others about contact with head lice.

I don't similar my schoolhouse'southward "no-nit" policy; tin CDC exercise something?

No. CDC is non a regulatory agency. School head lice policies often are adamant by local school boards. Local health departments may have guidelines that accost school head lice policies; cheque with your local and country wellness departments to see if they have such recommendations.

More on: Head Lice Information for Schools

Do head lice spread illness?

Head lice should not be considered as a medical or public health hazard. Head lice are not known to spread affliction. Head lice can be an badgerer because their presence may cause itching and loss of sleep. Sometimes the itching can lead to excessive scratching that can sometimes increase the risk of a secondary pare infection.

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Can head lice be spread by sharing sports helmets or headphones?

Head lice are spread well-nigh ordinarily by straight contact with the hair of an infested person. Spread by contact with inanimate objects and personal holding may occur merely is very uncommon. Caput lice feet are peculiarly adapted for holding onto human pilus. Head lice would have difficulty attaching firmly to polish or slippery surfaces like plastic, metal, polished synthetic leathers, and other like materials.

Tin wigs or hair pieces spread lice?

Head lice and their eggs (nits) before long perish if separated from their human host. Adult caput lice can live but a day or and then off the human caput without blood for feeding. Nymphs (young caput lice) tin can live only for several hours without feeding on a human. Nits (head lice eggs) generally dice within a week away from their human host and cannot hatch at a temperature lower than that close to the human scalp. For these reasons, the chance of transmission of caput lice from a wig or other hairpiece is extremely small, specially if the wig or hairpiece has non been worn inside the preceding 48 hours by someone who is actively infested with alive caput lice.

Tin swimming spread lice?

Data show that caput lice can survive nether water for several hours just are unlikely to be spread by the water in a swimming pool. Head lice take been seen to hold tightly to human being hair and not let go when submerged under h2o. Chlorine levels establish in pool water do not impale head lice.

Head lice may be spread by sharing towels or other items that have been in contact with an infested person's pilus, although such spread is uncommon. Children should be taught not to share towels, hair brushes, and similar items either at poolside or in the changing room.

Swimming or washing the hair within one–2 days later treatment with some head lice medicines might make some treatments less effective. Seek the advice of your health care provider or health department if you have questions.

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This information is not meant to be used for self-diagnosis or as a substitute for consultation with a wellness care provider. If yous accept any questions well-nigh the parasites described above or call back that you may take a parasitic infection, consult a wellness care provider.

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Source: https://www.cdc.gov/parasites/lice/head/gen_info/faqs.html