There are two reasons for a recurrent lice infestation: The lice treatment you used didn't work. You or someone in your family came in contact with lice again.
Parents typically blame other kids at school when their kids get lice, but some lice experts think that kids are more likely to get lice from family members at home or these other situations where head-to-head contact is likely: Sleepovers and slumber parties. Sports activities.
Some studies suggest that girls get head lice more often than boys, probably due to more frequent head-to-head contact. In the United States, infestation with head lice is much less common among African-Americans than among persons of other races.
There is no specific hair type that lice prefer. All lice need is a clean strand of hair to attach to. It doesn't matter the thickness, the length, if it's been colored, if it's straight, or if it's curly. It has been found that people with longer hair tend to report getting lice.
Because the active ingredients have remained the same all these years, new generations of head lice have become immune to them. Once lice become immune, the product no longer works. Scientists call this resistance.
Preventing Lice
Your child might have a positive blood type hence prone to lice infestations. However, the rest of the family members are likely to be blood type negative, and because lice don't like switching rhesus factors, they will not be affected as much.
Head lice can affect anyone but occur most often among children between the ages of 3 to 11 years old, along with their families. Children are more at risk, as they make head-to-head contact with other children when playing together and may share items that have contact with their hair.
Adults are not immune to head lice. In fact, if you have any close contact with children or even parents of children you can be at risk of catching them if they have them. Lice transfer primarily through head to head contact, so you would have to get close to the other person.
Spinosad (Natroba).
Spinosad is approved for adults and children age 6 months and older. It can be applied to dry hair and rinsed with warm water after 10 minutes. It kills lice and nits and usually doesn't need repeated treatment.
Teach your kids to hang up their coats and hats on an individual hook, or some other separate area when they get to school, instead of just throwing them in a pile with other classmates' clothing. Regularly clean things that your child's head has direct contact with that they share with other children.
You can get lice by coming into contact with either lice or their eggs. Lice can't jump or fly. They spread through: Head-to-head or body-to-body contact.
Infestation timeline
So if you look on the scalp and see no visible adult lice and several small nits, it's likely that you've caught lice in the earlier stages and had them for less than 2 weeks. Nits and nymphs: 1.5 to 2 weeks. If you see nits and small, moving lice, you've likely had lice for 1.5 to 2 weeks.
In order to have nits, you had to have had an adult female lay them. But it is possible to have Nits and no lice in the very early stages of an infestation.
Coconut, tea tree oil, lavender, eucalyptus, rosemary, lemon grass, and peppermint are scents popularly believed to repel lice. Using any coconut scented shampoo and conditioner is an easy way to increase your defense. At 1% concentration, tea tree oil killed 100% of head lice after 30 minutes.
Small studies have also shown that tea tree oil in combination with lavender oil can kill lice eggs and reduce the number of live lice. Tea tree oil seems to be relatively safe for use on the skin, although it can cause irritation or swelling for some. Remember, though, that it is poisonous if swallowed.
Head-to-head contact with an already infested person is the most common way to get head lice. Head-to-head contact is common during play at school, at home, and elsewhere (sports activities, playground, slumber parties, camp). Although uncommon, head lice can be spread by sharing clothing or belongings.
No one is immune, but frequent head checks help
Anyone can get lice, and personal hygiene has nothing to do with the likelihood of being infested, Rukke said.
The head lice may have become resistant to the treatment. If the treatment used does not kill the head lice, your health care provider and pharmacist can help you be sure the treatment was used correctly and may recommend a completely different product if they think the head lice are resistant to the first treatment.
Firstly, it is important to understand that all types of hair can get head lice and no hair type is immune to them. In fact, curly hair is often more vulnerable to catching them because it has more volume than straight or thin hair.
In the past, kids with head lice were kept home from school. But now doctors don't recommend these "no-nit" policies. In most cases, a child who has lice should stay at school until the end of the day, go home and get treatment, and return to school the next day.
If you're infested with body lice for a long time, you may experience skin changes such as thickening and discoloration — particularly around your waist, groin or upper thighs. Spread of disease. Body lice can carry and spread some bacterial diseases, such as typhus, relapsing fever or trench fever.
Life span on humans
As long as there's a food source readily available, an adult louse can live for as long as 30 days on a human. However, lice can continue to multiply. Female lice lay up to six eggs each day. Although lice can spread on inanimate objects, they won't spread between you and your pets.
Typically, 10–15 head lice are found. The number of lice often depends on personal hygiene, for example, how often the person bathes, shampoos, or changes and washes his/her clothing.