Infection with head louse or the Pediculus humanus capitis in human hair and scalp can be detected by looking closely through the hair and scalp for nits, nymphs, and/or adults.
- Nits are easy to see around the hair. They are firmly attached to the hair shaft and if they are found close to the scalp it confirms that a person is infected. Nits found more than ¼ inch from the scalp, probably indicate that the infestation is an old one.
- Nits are usually easy to see but if the diagnosis is difficult they can be easily identified under a microscope.
- Finding a nymph or adult confirms the diagnosis, but that may be difficult, as they are lesser in number and can move away quickly from searching fingers.
- If the diagnosis of infestation with head lice is not clear, consult a health-care provider, school nurse, or a professional.
Diagnosis of infestation with head louse can be confirmed if nymph, adult lice or nits close are found close to the scalp.
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