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Head lice glue their eggs (nits) onto the base of a hair. About 5 to 10 days later the nit hatches into a nymph which feeds on the human scalp almost immediately, and for a couple of weeks before reaching the adult stage (louse). An adult louse feeds on the human several times per day, and can live for more than a month on the head, laying up to 4 nits per day. An adult louse can not live very long off the human head (usually only a couple of days at most).

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Q: What are the stages of head lice?
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