When it comes to lice, many people are certainly not strangers, in the past few decades, most people have lice on their bodies, this pest that tormented the entire 60s, 70s, 80s, 90s, how can it disappear in the blink of an eye?
First, childhood nightmares.
A few decades ago, there was such a strange phenomenon that people often touched the east and west with their hands on their bodies, and the same was true when eating, sleeping, chatting, and working.
Are they having any special fetishes? No!
Just because they have lice on them, that strange itching sensation is enough to make people crazy.
And when the light is good, you can often see lice climbing and jumping randomly on top of people's hair.
In order to catch this group of small things, in addition to looking for them with their own hands, they will also ask the people next to them to help, rummaging around in the corners of clothes or bedding, when grasping this small thing, just need to put it on the top of two fingernail covers, squeeze it gently, only listen to the sound of "popping", this harmful little thing will go to the western sky.
In addition to catching by hand, a tool called grate is often used, just like combing hair now, just holding the grate from the root of the hair along the bottom of the comb, you can immediately see a surprising number of lice falling down in pieces, and there are dense lice on the grate, this scene can make the dense phobia sufferer collapse.
In addition to using grates, people who are overwhelmed come up with ways to solve problems, cutting their hair short and even shaving their heads. Of course, washing your hair with hot water is also a way, after each washing, looking at the dense "small sesame seeds" in the basin, the feeling is really relaxed.
Second, ancient creatures.
In fact, lice are a parasite, they live on mammals, people, pets, livestock are also the most common boarding bodies, they rely on blood sucking for a living, but also the main culprit in the spread of epidemic class rash, cold, lice-transmitted return fever and trench fever and other diseases.
The lice that generally reside in the human body are divided into three types.
1. Body lice.
2, head lice.
3, pubic lice.
The most common are body lice and head lice, which are the childhood nightmares of many people.
Most of the time, the lice are white, and sometimes its body turns red or even black, because it sucks a lot of blood .
Lice are a particularly ancient creature that appeared 65 million years ago, much longer than humans, when they would inhabit ancient animals.
On April 6, 2011, the British Post reported that British and American scientists pointed out after research that because of the perennial torture of lice, the temper of dinosaurs would become extremely grumpy.
Tens of thousands of years ago, the ancestors of mankind were plagued by lice. When humans began to put on clothes, lice had better hiding places, became more difficult to find, and their numbers increased rapidly, and their species became more numerous.
They usually hide in the gaps in clothes or skin folds, and when they are hungry, they come out to forage, they will find a perfect place to forage, make a small hole in the skin to suck blood, and at the same time, it will secrete a substance that is used to numb the wound and make the victim temporarily feel no pain.
The lice have a particularly large appetite, eating many times a day, and each time they will prop up their stomachs to a bulging state before they end their foraging, which is why the itching will continue to appear uninterrupted.
The lice are very small, the adult worms are at most the size of a sesame seed, and the blood smoked each time accounts for a very small part of the entire human body, which should have little impact.
But after each lice bite, there is an itching sensation, the itch is unbearable, no matter what you are doing, this sudden itch will make you miserable.
The most frightening thing is the lice that carries the infectious disease, and once it is bitten by it, the consequences are unimaginable.
Third, the intractable lice.
Therefore, the battle between humans and lice began very early, from the grate before 1600 years ago, to the later hair cutting and hair washing, people have been fighting against lice, but unfortunately, no matter what method is used, it can only be effective for a short time, and soon after the lice inexplicably come back, and the number is more, what is going on?
This should start with the habits of lice, which are actually very fragile creatures, which are afraid of cold and heat, so they will not leave the host unless they have to.
Lice live less than two months at most, and what really makes lice so rampant is their ability to reproduce, they lay eggs every day, ten times a time, and it only takes a week for them to mature and reproduce in the next wave.
The most frightening thing is that they will lay eggs at the root of the hair follicle or deep in the crevices of the human body, and the general method cannot reach this depth, so even if you completely remove the lice from the body, it only takes a few days for them to bloom everywhere.
If the lice leave the host, they can continue to live for about 3 to 10 days, and if you inadvertently touch the lice at this time, it will come back to you.
Animals infected with lice or clothing with lice are also an important source of infection.
That is to say, as long as there is still a lice in the surrounding environment, they can multiply at a terrifying speed until they become a disaster.
Fourth, the slowly disappearing lice.
After thousands of years of struggle, lice still exist, but why in just a few decades, lice seem to suddenly disappear, careful friends can recall, the last time they saw lice was when?
What is the reason for this?
In fact, this has a huge relationship with the improvement of modern living standards, mainly for the following reasons.
1, the improvement of health awareness.
People today are different from before, they bathe and change their clothes very often and frequently, and lice do not have a chance to multiply.
2, urbanization construction.
A large number of rural people poured into the city, and the city is far away from the dirty and chaotic environment, livestock, animals can not be contacted, isolated from the way of infection, even the pets in the city will bathe every day, very clean.
3, the popularity of drugs.
With the development of medicine, human beings have developed a large number of drugs, even if they are infected with lice, they can be solved in a short period of time, and they will not be given the opportunity to reproduce.
Of course, lice are not extinct, they are only relatively rare in cities, and they still exist in poor rural areas, livestock concentrations, wild animals, etc., and the number is amazing, and it can even be described as a flood.
For example, in slums around the world, lice are rampant and are the main transmitters of infectious diseases, which is caused by poor sanitation in slums.
And as a creature with at least 65 million years of history, it is not so easy to become extinct!
epilogue
Now I know why lice are becoming less and less common, but we still can't forget that in many parts of the world, it is still rampant, and the road to killing lice is still very long.
Did you have this experience as a child?
In what way are lice are used to kill lice?
Welcome to leave a comment in the comment area to discuss.