Causes & Health Information
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Symptoms
- Itching of the scalp is the main symptom.
- A scalp rash may be present. The back of the neck is the favorite area.
Lice and Nits
- Lice are 1/16-inch (2 mm) long gray-colored bugs. They move quickly and are difficult to see.
- Nits are white eggs firmly attached to hair shafts near the skin. Unlike dandruff or sand, nits can't be shaken off the hair shafts.
- The nits are easier to see than the lice. Nits are white and very numerous.
Lifespan of Lice
- The nits (eggs) hatch into lice in about 1 week.
- 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.
- Adult lice survive 3 weeks on the scalp or 24 hours off the scalp.
Cause
- A tiny insect the size of a sesame seed
Transmission of Head Lice: Live Lice, Not Nits
- Only live lice can give lice to another child.
- Nits (lice eggs) cannot pass on lice. Nits are attached to the child’s hair.
- Almost all spread of lice is from direct hair-to-hair contact. Lice cannot jump or fly to another person’s hair.
- The spread of lice from hats, hair brushes or combs is not common. Headphones and other objects also do not usually spread lice.
- Most often, the spread of lice to others occurs at home, not school. Sleepovers and bed-sharing are a major source.
Return to School
- Your child can return to school after 1 treatment of anti-lice shampoo.
- A child with nits only doesn't need to miss any school or child care. Nits do not spread to others, nor do they cause lice in others.