Wen | the whole point of science popularization
In the past, as long as the child's stomach hurt, the adult would come to say: there are worms in the stomach! Then I took a packet of pagoda candy, and soon after eating it, the pain subsided, and the effect was particularly fast. Many children lie that they have stomach pains in order to cheat on candy.
The long worm in the stomach refers to roundworms, which and lice can be described as the two major "popular insects" in the 70s and 80s, and almost everyone has it.
At that time, many children were often able to pull out half-cut insects that were jumping around and resembling earthworms, and sometimes in order to pull them all out, they had to pull it all, and the picture sense was very strong. However, it is almost impossible to hear such words as a bug growing in the belly of a child anymore.
Why is it that a roundworm that almost everyone had in their stomach decades ago has not heard of it now? Let's first understand what roundworms really are.
What exactly is the roundworm that has infected 500 million Chinese people? What are its features?
In 1986, the Third International Parasite Academic Conference concluded through statistics:
Worldwide, about 25% of people have been infected with roundworms, and the infection rate is as high as 70%, mostly in tropical and subtropical areas;
The population of China infected with roundworms is 531 million, and the infection rate is as high as 60%-90%, but because its impact is not obvious, many people do not notice.
Roundworms belong to the nematode animal phylum, is the most common parasite in the human body, mainly parasitic in the small intestine, up to 35 cm long, it will be like earthworms in the human intestine peristalsis, with feces are excreted.
shape:
Roundworms look very much like earthworms, but do not have the obvious head of earthworms, although the appearance is horizontal but it looks smooth, the color is white with yellow or pale pink; the male tail is slightly curled, the diameter of the head is relatively large, and the female is straight and small.
Inability to be digested by the gastrointestinal tract:
Roundworms can parasitize in the human stomach and intestines and will not be digested, mainly with a protective film - the elastic cornea that is anti-host digestive enzymes.
This cornea is highly corrosion resistant, can resist any physical, chemical and various biological damage, has a strong longitudinal elasticity, and can maintain the hydraulic pressure in the body to maintain a full form, the human body does not have digestive enzymes that can decompose it.
Spawning more and longer lifespan:
Roundworms reproduce differently from most parasites, after the eggs enter the human body, the female worms ovulate and become fertilized eggs before they can split and develop, and multiple metamorphosis occur in the human body, a process that takes about two months;
The number of eggs laid by each female is 240,000 per day, while the number of adult worms parasitizing the human body is as few as ten or more than hundreds, and the lifespan of each roundworm is 1 year; this means that every day the roundworm eggs in the human body may be as high as a million, and it will occupy our digestive tract little by little, which is unbearable just by imagination.
So, why do roundworms grow in people's stomachs? Will the human body be affected?
How do roundworms enter the human body? What are the consequences of contracting roundworms?
People in the 1970s and 1980s believed that roundworms grew in the stomach because they ate raw sweet potatoes or ate undercooked food by mistake.
In fact, the infection rate in rural areas is higher than in urban areas, and the infection rate of children is also higher than that of adults, mainly because the infrastructure such as medical care in rural areas is not perfect, people are sometimes not in place in handling food, and children have no concept of health requirements.
Roundworm eggs are generally attached to "food", and as people ingest food, they enter the stomach and intestines together, and roundworms in the human body mainly develop from the intake of infectious eggs.
At a constant temperature of 37 ° C, the eggs reach the conditions of hatching, then ingest intestinal nutrients, and then enter the alveoli to absorb oxygen; as the volume grows larger and larger, the roundworm gradually enters the trachea and esophagus, and then enters the intestine again along the throat, where it multiplies, mates and lays eggs.
With the increasing number of roundworms, the human body will gradually appear in various conditions, such as teeth grinding, insomnia, stomach pain, intestinal bleeding, etc., and may even cause other problems.
In order to avoid worsening the situation, many people specially take children to fight insects, or give children to eat pagoda sugar containing piperazine phosphate from time to time to achieve the purpose of relieving pain and paralyzing roundworms.
Nowadays, whether in rural or urban areas, children or adults, basically no one mentions roundworms, why is this? Have people eliminated roundworms?
Why are so few people mentioning roundworms now?
People no longer deliberately fight insects, mainly related to the progress of the times.
Living standards have improved
In the past, people were able to have a bite to eat, it was already lucky, and they didn't care whether the food was fresh and clean, or whether it contained parasites, eating raw food and drinking raw water was the norm;
With the improvement of people's living standards, most people no longer focus on eating enough, but to eat well, eat healthy, and the requirements for diet are getting higher and higher.
Everyone drank boiled water, ate cooked food, fruits and vegetables, etc., and had to be cleaned before eating, and the eggs were basically washed away.
The infrastructure is gradually improving
In the past, the high rate of roundworm infection was related to the imperfect construction of medical conditions, and with the progress of the economy, the infrastructure was gradually improved, and people could seek medical treatment in time if they were uncomfortable, and the insects in the stomach were cleaned in time, and naturally they would not appear again.
All in all, people now almost do not mention roundworms, mainly because the living conditions are good, everyone has relatively high requirements for food, clothing, housing and transportation, roundworm eggs can not continue to enter the human body through ingestion, and there will naturally be no more in the human body.
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