The oldest physical evidence of head lice on a human was a nit found on the hair of a 10,000-year-old body at an archeological site in Brazil. Lice combs have been found in the tombs of Egyptian royalty, and even Cleopatra was said to have solid gold lice combs buried with her.
Clade B head lice are thought to have originated in North America, and then to have migrated to farther reaches of the world, including Australia and Europe.
Human evolution and lice
Beginning somewhere around 13 million years ago, specific species began to evolve to affect only humans. About 42,000 to 72,000 years ago, human lice separated into head and body lice.
8,000 BC, Brazil
According to archaeologists, the world's oldest known head lice- actual nits discovered on a human head- were found at an archeological dig in northeast Brazil. They estimated that the specimen was at least 10,000 years old.
One is universal and evolved on modern human heads. The other, found only in the Americas, they think probably evolved on an earlier and now extinct human species, and jumped onto Homo sapiens during an encounter in Asia 25,000 to 30,000 years ago, perhaps during fights, sex, the sharing of clothes or even cannibalism.
Adult lice can live up to 30 days on a person's head. To live, adult lice need to feed on blood several times daily. Without blood meals, the louse will die within 1 to 2 days off the host.
Introduce natural predators (Ladybugs)
Ladybugs can eat 100 lice a day!
Head lice infestations are common, affecting an estimated 6 million to 12 million people each year. Lice are most common among school-age children who are more likely to have close contact with each other or share combs, brushes, hats and other objects that touch the hair.
Parasites such as lice have a role in the conditioning of a 'natural' immune system and reducing the likelihood of immune dysfunctions, a study of mice from a Nottinghamshire forest indicates.
Permethrin lotion, 1%;
Permethrin lotion 1% is approved by the FDA for the treatment of head lice. Permethrin is safe and effective when used as directed. Permethrin kills live lice but not unhatched eggs. Permethrin may continue to kill newly hatched lice for several days after treatment.
You can find head lice on the scalp, neck, and ears.
Their full life cycle, from egg until death, lasts a maximum of 35 days. The eggs are called nits and hatch into small insect forms — called nymphs — which then grow into adult lice. The adult lice can begin to create more eggs as soon as they hatch and the cycle begins again.
Data show that head lice can survive under water for several hours but are unlikely to be spread by the water in a swimming pool. Head lice have been seen to hold tightly to human hair and not let go when submerged under water. Chlorine levels found in pool water do not kill head lice.
You Have to Treat Them
Head lice will not go away on their own. If you think your child has an infestation, there are several steps you should take right away. Call your doctor to confirm the diagnosis. Notify your child's day care or school so other students can be checked.
Head lice survive less than one or two days if they fall off the scalp and cannot feed. Head lice eggs (nits) cannot hatch and usually die within a week if they do not remain under ideal conditions of heat and humidity similar to those found close to the human scalp.
In fact, adults can get lice anytime their hair is in close contact with the hair of someone who has lice. Whether public transportation, concerts, or crowded areas, any situation in which there is hair to hair contact puts adults at risk of getting lice.
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.
Head lice also have one pair of eyes. Eyes are present in all species within the Pediculidae family, but are reduced or absent in most other members of the Anoplura suborder. Like other members of the Anoplura, head louse mouthparts are highly adapted for piercing the skin and sucking blood.
An adult louse will feed on human blood 5 to 6 times per day to survive. Each time they use small, sharp teeth at the end of a tube that acts as its mouth. The louse will use this tube as a suction cup, cling to the skin of its host, and insert the sharp teeth to penetrate the skin and feed on blood.
Pesticides called permethrin and malathion can also be problematic for lice treatment. Permethrin is found in popular over-the-counter products, such as Nix. Malathion and lindane generally require a prescription for drugs that go by the names Ovide or Kwell, respectively.
In addition, use a mint based shampoo at least once a week so the smell of peppermint is always in their scalp, which is where lice like to live.
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.
Blow dry your child's hair. It has to be thoroughly dry down to the scalp to suffocate the lice. Expect this to take 3 times longer than normal drying. The dried Cetaphil will smother the lice.
Use heat. Wash any items used or worn by the person in hot water, and dry them on high heat. Lice and nits die when exposed to temperatures higher than 130 F for more than 5 minutes. Wash anything that touched the person's skin or scalp, including jackets, hats, scarves, pillowcases, sheets, and headbands.
The conditioner does not kill lice but stuns them for about 20 minutes enabling easier removal. The long toothed metal comb will remove nits and the stunned head lice. Wipe the comb on a white tissue and check for any lice or nits. Keep combing until no more appear on the tissue.