How do parasites and lice come into being? What's the quickest way to remove it? How to prevent lice? Detailed treatment method is attached.

When it comes to the parasite "lice", everyone probably feels disgusted. In the case of poor hygiene in the past, many people have had head lice, which often occur in children, especially girls. How did the lice come from? What's the quickest way to remove it?

Lice belong to the insect class, lice order, human lice family. It is a wingless insect with a flattened back and abdomen and is a permanent in vitro parasite. It is also a general term for a class of wingless small parasitic insects, divided into two large groups: the suborder obtuscata and the suborder Cephaloptera (also known as chewing lice or biting lice), parasitic on birds and mammals, and sucking lice, parasitic only on mammals.

Lice are parasitic insects that fully adapt to the host body surface environment, and the requirements for the parasitic environment are relatively constant and specific. For example, the optimum temperature of body lice is 30-32 degrees Celsius, which is the temperature of human body surface. The optimum relative humidity is 10% and 60%. I don't like humidity and heat. There is a tendency towards darkness. Therefore, after the weather turns warm in spring, when the host sweats or has a fever due to activity, lice are easy to climb from the body surface to the outside of the clothes and spread outward through the contact of the host or clothes. Nymphs and adults of lice suck blood, and only suck human blood. The amount of blood sucking can generally reach more than 1 per cent of its body weight.

Lice, a parasite, is the main medium for the transmission of epidemic class rash, cold, lice relapsing fever and trench fever. Its adults and nymphs feed on the host all their lives, and there are three kinds of lice parasitic on the human body: body lice, head lice and pubic lice, of which body lice are the most common.

How do lice come into being?

The researchers believe that one of the most likely explanations for lice is that one of them has been parasitic on our ancestors, "modern humans". When "modern people" began to breed in Asia 20,000 years ago, another kind of lice transferred from "Homo erectus" who also lived in the region to "modern people". The researchers point out that only direct contact such as fighting, getting dressed or having sex can transfer lice from one species to another. Therefore, it is certain that Homo erectus must have had close contact with "modern people" before it became extinct.

What kinds of lice are there?

1. Body lice: the body lice is gray or gray-white, the head is slightly olive-shaped, the fusion of the sternal segment can not be distinguished, and there are a pair of stomata on both sides of the middle chest. The abdomen is long and flat, divided into 9 segments, and the appearance can be seen in 7 segments, with a pair of stomata on both sides of each node. The tail end of the abdomen of male lice is round and obtuse, and the tail end of female lice is bifurcated, similar to the shape of W.

2. Head lice: the body color of head lice is dark, the body size is small, the edge of abdomen is dark black, and others are similar to body lice.

3. Pubic lice: pubic lice are gray-white, the body width is almost equal to the body length, the abdomen is short, the segments are not obvious, there are verrucous protruding on both sides, the last pair is the largest, the front leg is small, the middle and hind legs are thick.

What symptom does lice bite have?

1. Itching is the main symptom of lice bites. Lice make holes or holes in the skin with their claws, and itching occurs when lice bite and inject saliva.

2. Pubic lice bugs can be found in the root of hair follicles, light black, grayish white or red (sucking blood), and small granular eggs can be found directly in some patients.

3. There are often micropores in the lice bites, local redness, small red spots and blood scabs. Infection often occurs because of scratching, including pustules, exudates and scabs.

4, near the affected area can be seen 1 cm large bluish gray spots, painless, pressure does not fade, can last for several months, can also be seen in the chest and abdomen, the inside of the thigh and other places.

How to get rid of lice?

Lice on the head

1. Eat vinegar to remove lice: people with lice on their heads can wash their hair with white vinegar.

Wet the hair and scalp, the back of the ear and the back of the neck with white vinegar, then wrap it tightly with a towel or plastic wrap for five to ten minutes, during which a large number of lice will die after being fumigated with white vinegar. and then wash your hair.

Although it is true that white vinegar can kill grown lice, it is not clear whether it can kill lice eggs.

2. If you have lice on your head, you can follow the hair and destroy it.

Patients can wash their hair first, lice can not move after getting wet, will come out of the hair to breathe, will appear on the surface of the hair, hair tips and temples, so that it can be eliminated.

3. Shave off your hair: if a person has lice on his head, it is best to shave the hair with lice, and then wash the skin thoroughly, so that the lice can be completely removed.

4. Use sulfur ointment: people with lice on their heads can apply sulfur ointment or forest stone cream to areas with lice, but this method is not a radical cure. It needs to be used three to five times a day for about a month.

5. Alcohol to kill lice: 10ml alcohol and 90ml neutral shampoo are mixed into lice control solution. When there are lice in the hair, add water to dilute it 100 times, soak the hair with diluent, rinse it with clean water after half an hour, and kill lice for 3 days in a row.

Lice grow on the body

1. Killing lice at high temperature: when lice are found, underwear, quilt covers and bed sheets can be boiled and scalded in water above 65 degrees for about 10 minutes to kill the adults, nymphs and eggs of lice.

2, smear drugs: the breeding speed of lice is very fast, if you want to get rid of it, you must fundamentally prevent it. At this time, you must not buy medicine to get rid of lice. You can go to the drugstore for consultation and buy less harmful medicine to go home to get rid of lice.

Pubic lice

1. Shaving pubic hair: pubic lice will hold on to the dry hair tightly, so shaving pubic hair is a necessary treatment. Shave off pubic hair and burn it, which can eliminate the parasitic ground of pubic lice. At the same time to avoid sex life, underwear should also be disinfected, keep clean and hygienic.

2. Drug treatment: the drug treatment of pubic lice can usually choose sulfur ointment, Lindan lotion, malathion lotion, 25% benzyl benzoate emulsion and methamphetamine, etc., these drugs have the effect of killing adults and eggs of pubic lice.

How can we prevent lice?

1. Pay attention to personal hygiene: wash your hair frequently, try not to get caught in the rain as much as possible, and try not to get wet when washing your hair. You can rub your hair with your hands and wash your hair with clean water. It is recommended to wash your hair at least twice a week.

2. don't grow long hair: if children follow their grandparents for a long time, parents are advised not to let them grow too long hair, so that the probability of lice will be lower.

3. Wash clothes at home: when a child has lice on his head, you can take out everything in the house and wash it. It is best to soak it in hot water, so as to avoid repeated attacks of lice.