How Do Head Lice Reproduce?

Head lice can reproduce in one of two ways. They can either reproduce sexually or by parthenogenesis. These two ways of reproduction have different requirements for female lice. The first way relies on donation, while the second way relies on fertilization. Lice reproduce in approximately 35 days. During their life cycle, lice must feed on the blood of their host.

A female louse lays one or more eggs per day. The eggs hatch within a week, and the nymphs then go through three growth spurts and molt several times before they become adults. Lice can remain on their host for up to 30 days, but not all of them make it. This constant reproduction means that the population of lice is constantly growing. If you’ve noticed lice on your head, you may already have an infestation and need to seek treatment.

Head lice spread easily. They can’t jump or fly, but their claws allow them to cling to the hair of other people. It’s not possible for pets to catch the lice, but children in child care or elementary school are the most common victims of head lice. During the holidays, head lice can spread between kids. They can be passed from one child to another by playing with their heads or cuddling.

Head lice eggs are difficult to see and are often mistaken for dandruff or hair spray droplets. The eggs are laid by the adult female at the base of the hair shaft nearest the scalp. They are white and oval in shape, measuring about 0.8 mm in diameter. The eggs hatch in about a week, and the viable ones stay close to the scalp.