This summer's hot weather continues, and citizens across the country are extremely hot, almost all of them playing in the water to survive this period of high temperature.
At the same time, netizens from many places in Sichuan are playing with water to cool off, frequently found in the waters there are more than ten centimeters of linear organisms in the activity, the Internet also circulated a lot of videos and photos, for a time "Sichuan surprise dragon nematode" on the hot search, caused a lot of people's attention and hot discussion.
Fortunately, the Sichuan Center for Disease Control and Prevention combined with epidemiology, biological morphology and conventional monitoring and other technical means to make an official statement that the nematodes found in many places in Sichuan are not "dragon nematodes".
Many people may not understand, why a small dragon worm can be on the hot search? Don't underestimate it, there have been millions of people who have suffered from it, very painful, so what is a dragon nematode?
The parasite of all evils, the Dragon Nematode.
According to the data, the dragon nematode belongs to the order nematodes, the dragon nematodes, is a large nematode that parasitizes deep in the body of mammals, mainly living in the tropics, subtropics, and is often called "guinea worm", because the dragon nematode was first found in Guinea in Africa and caused serious damage to Guinea.
Not to mention the living conditions in Africa before, even if the standard of living has been greatly improved now, Africa is still particularly backward in all aspects compared with other countries, and the living conditions are still so unsatisfactory, so most Africans have very low requirements for their own lives, and they are very satisfied when they eat every day, and they do not care about their living conditions at all.
Even the most basic water is not boiled and directly drunk, and it is precisely because of this unhygienic lifestyle that African parasites can easily enter the human body through various channels, as well as in mammals.
In the 1970s, life in Africa was even more chaotic, every year about 3.5 million people were parasitized by dracunculiasis, infected with dracunculiasis, clinical manifestations of chronic skin ulcers, accompanied by nausea, vomiting, dizziness and other symptoms, although the disease does not cause death, but the onset of the disease is very painful, even the treatment is also very painful, can only be described as "pain does not want to live".
And in the human body parasitic dragon nematodes are generally medina dragon nematodes, its shape is slender, colorless, like a nylon wire, both male and female can parasitize, of which female nematodes not only have a relatively long lifespan, and the body length is also much longer than the male nematodes, it is understood that female nematodes can grow to about 120 cm, males can only grow to about 4 cm, so the living nematodes in the human body are mostly females.
Now that we know about dragon nematodes, the key question is, how did such a slender parasitic insect enter our human body?
The path of dragon nematode parasitism begins with larvae.
Although the water of the river and the lake feel very clear and drinkable at a glance, there are also many small creatures in these waters, including an arthropod called the water fleas, and the guinea worm often parasitizes in them.
When people directly drink river water, lake water, will bring water fleas and this nematode into the stomach together, and the presence of stomach acid in the human body, can directly eliminate the water fleas, but this nematode "acid resistance" ability is a little strong, not affected by stomach acid, can be smoothly shuttled in the human body, and absorb human nutrients to grow, and eventually develop to the adult stage.
Any organism naturally has the ability to mate when it reaches adulthood, and this nematode is no exception, they will multiply rapidly in pairs, after which the male adult will die, and the female adult will find a suitable place in the human body to give birth, and this place is our skin, and after the female adult gives birth, a blister will form on the skin to make you feel uncomfortable.
That feeling is simply unbearable pain and itching, like being burned by fire, some people in order to relieve the pain, will continue to scratch or put their feet into the river water, when the blisters burst, the larvae inside it will flow out, if these larvae happen to enter the water again, they will parasitize again in the body of the flea, waiting for a new host, and then start the cycle of life again.
Speaking of which, there is another more cruel point to share with you, that is, the handling of nematodes. When the skin is torn, the laying larvae will protrude and can be seen on the surface of our skin, and the white slender lines can be dragged out.
But because the nematodes are relatively long, so the surface of the probing body can only see a small part of the body of the nematode, the remaining long part is still located deep in our skin, if the force is too strong, it is easy to drag off, so it can only be slowly pulled out, sometimes it may take more than ten hours!
Parasitism is a strategy for the long-term survival of many animals, and the symbiosis is different, parasitism needs to rely on the host to survive, will absorb the host's nutrients to maintain its life survival, so parasite parasitism in the host body development and reproduction, will cause a series of damage to the host.
But at present, we humans can not absolutely eliminate these parasites, can only try to avoid, so we must not drink raw water, especially children, their resistance is still very weak compared to adults.