How does schistosoma form, is it life threatening?

The main transmission route of schistosoma is by eggs, among which freshwater snails are the only intermediate host of schistosomiasis, often some fecal fertilization, poor management of toilet waste discharge, resulting in water pollution, providing parasitic conditions for schistosomiasis, through the transmission of these water sources and some freshwater snails, the human body is susceptible to infection, especially for the first time, acute infection often occurs. In the late stage of schistosomiasis, there will be a large area of tissue fibrosis around the portal vein, among which liver cirrhosis, giant spleen, and ascites are typical clinical symptoms, so the initial infection must be treated in time.

Schistosoma parasitizes most vertebrates, and there are six species of schistosoma haematobium (Schistosoma haematobium) that live in the veins of the bladder, mainly in Africa, southern Europe, and the Middle East. The egg passes through the wall of the vein into the bladder and is excreted with urine. The larvae develop in the body of intermediate host snails, mainly Bulinus and Physopsis.

Mature larvae enter the body of the terminal host through ** or mouth. Schizodiac mansonii (S. mansoni).Mansoni (i.e., Schistosoma mansoni) is found in large and small intestinal veins, mainly in Africa and northern South America.

The eggs are excreted in the stool. The larvae enter the snail and then return to the final host through **. Schizosoma japonicus (S. japonies)

Japonicum, i.e., Schistosoma japonicum) is mainly found in Chinese mainland, Japan, Taiwan, the East Indies, and the Philippines, and in addition to humans, it also infects other vertebrates such as domestic animals and rats. The intermediate host is a mollusk of the genus Oncomelania. In adult worms in the mesenteric veins, some eggs travel with the bloodstream into various organs, causing various symptoms, such as hepatomegaly.

In severe cases, it causes the death of the host. Millions of people in Africa and East Asia get schistosomiasis. In addition, there are intercalated schistosomiasis, Mekong schistosoma and Malayan schistosomiasis, which are distributed in 10 countries in Central Africa, the Mekong River basin and Malaysia, respectively, and are relatively mild.

Schistosoma parasitic in humans are different from other human parasitic trematodes in terms of morphology, physiology and life history, such as schistosomiasis hermaphroditic; Adult worms parasitize in the mesenteric veins or vein plexus of the bladder, and eggs are excreted in feces or urine, depending on the species; The tail of the cercariae is forked, and it invades the main body through ** in the water; There are no thunderlarvae and cystic stages in the life history. Taking Schistosoma japonicum as an example, we will give a more detailed description and briefly introduce Schistosoma mansoni and Schistosoma haematii.

Snails, the host of schistosomiasis, generally live in watery areas such as grass flats, ponds, and ditches. If people come into contact with water in unidentified waters in the wild, the larvae of schistosomiasis can easily enter the body and cause infection. At the same time, infected people can have larvae in their stool.

If excreted in the wild, the larvae enter the snail through water, causing a vicious circle of large-scale spread.

Schistosoma live in all parasitics, most of them are parasitic in the camp, and a few are parasitic outside the camp. Dioecious schistosomes, parasitic in the veins of mammals.

Vampire and schistosomiasis are the same thing, but people call them differently.

Schistosoma is a zoonotic parasite. There are many kinds of storage hosts, mainly more than 30 kinds of animals such as cattle, pigs, dogs, sheep, horses, cats and rodents. Sick people and diseased cattle were the main sources of infection, followed by infected sheep, pigs, dogs, horses, rodents, etc.

In some areas where there is no animal activity for a long time, schistosomiasis is transmitted among wild animals through snails, forming a primary foci; In residential areas or production areas where humans and animals are active, the foci constituted by the transmission of snails are secondary foci.

People are generally susceptible, and the infection rate of the population is directly proportional to the infection rate of local snails. Most of the patients are fishermen and farmers, especially young adults aged 15 to 30 years old who have a high infection rate due to repeated exposure to infected water. There are more males than females, and the infection is most common in summer and autumn.

Children and people in non-endemic areas can develop a certain degree of resistance once they are exposed to a large number of infections, and their tolerance to reinfection is not complete, so reinfection often occurs.

The scientific name of schistosoma is Schizosome, and the important species that parasitize humans are Schistosoma japonicum, Schistosoma mansoni, Schistosoma ehrli, and Schistosoma mekong.

There is only Schistosoma japoya in our country, which is dioecious. The males are stubby and short, with an average body length of 16 mm, and are milky white. The female is slender, the anterior end is slender, the average body length is 20 mm, and the posterior part of the body is dark brown because the intestinal tract is filled with digested hemoglobin; Females are often in the male cuddle groove and are in a state of hugging, and the two are parasitic in the hepatic portal vein and mesenteric venous systems of humans and mammals such as cattle, sheep, pigs, rats, rabbits, etc.

Adults of both sexes have small nodules or spinous protrusions on the body surface of part or all, the mouth and abdominal suckers are located at the front end of the worm, the worm body is adsorbed on the inner wall of the vein by the suckers, and through the mouth and the abdomen suckers, they prostrate and migrate to the vein terminal of the intestinal submucosa, where they mate and lay eggs, the eggs are oval, light yellow, and the eggs contain tricariae.

Blood-sucking bugs have conquered almost every ecosystem on Earth, including us humans. Now, scientists will take you to learn about the darkest side of the insect world. Come face-to-face with the biggest, most disgusting, and deadliest bug in the world.

Infestation cone bugs.

Many believe it killed Darwin.

It steals in the night, piercing the ** of the sleeping and stealing blood.

Its bloodthirsty habits transmit a parasite that causes a deadly disease——— Chagas disease.

No, schistosomiasis is a disease, and bloodsuckers are a worm, such as leeches.

No, schistosomiasis is a disease, and bloodsucking worms are a worm.

No, schistosomes are in the water and will die if bitten.

Patients with schistosomiasis can have no symptoms in the early stage, or they can have symptoms such as abdominal pain, diarrhea, blood in the stool and fatigue, but generally do not attract people's attention. If a child suffers from schistosomiasis, it affects growth and development, and he is not tall, has low intelligence, and looks like a little old man; Women with schistosomiasis have irregular menstruation, which affects fertility and lacks the joy of life. If it develops into advanced schistosomiasis, there will be ascites in the abdominal cavity, liver and spleen enlargement, manifesting ascites: big belly, thin bones, and some will vomit blood, which is really unbearable, seriously affecting labor production and life, and it is impossible to get rich by labor. The harmfulness of schistosomiasis is that it affects the "five lives" of life, production, life, growth and fertility.

Causes a large stomach and weakened liver function

The life cycle of schistosoma includes six stages: adult, egg, tricholaria, cytosis, cercariae and larvae.

People or other mammals infected with schistosomiasis shed eggs in their feces, and if the feces contaminate the water, the eggs are carried into the water and the larvae hatch in the water. The larvae can swim freely in the water and actively burrow into the snail in the water, develop into a maternal cyte, reproduce asexually, and produce daughter larvae.

The daughter larvae reproduce again to produce a large number of cercariae, which leave the snail and swim freely in the water. After people come into contact with water containing cercariae in various ways such as production labor, domestic water, swimming and playing, cercariae will quickly burrow into the human body, and after entering the human body, they will transform into juvenile insects, and after a certain period of growth and development, they will eventually settle in the blood vessels near the liver and intestines and become adults. Female and male adults hug together and mate to lay eggs, and each female can lay two or three thousand eggs per day.

Such a cycle is the life of a schistosomiasis, i.e., a life cycle.

In the life history of schistosomes, there are two hosts, one is the adult parasitized humans and other mammals, called the terminal host, and many species of mammals can be the terminal host of schistosome; The other is a larvae-infested snail called an intermediate host, and the snail is the only intermediate host for Schistosoma japonicum.

Schistosomiasis is an endemic parasitic disease caused by schistosomiasis parasitizing the human body. There are three main types of schistosomiasis that parasitize humans: Schistosoma haematoidosis, which is endemic in northern Africa; S. mansoni is endemic in Latin America and central Africa, and S. japonicum is endemic in Asia.

In China, because only Japanese schistosomiasis is prevalent, Japanese schistosomiasis is usually referred to as schistosomiasis. Schistosomiasis is seriously endemic in the Yangtze River basin and 13 provinces, municipalities and autonomous regions south of the Yangtze River in China, and it is estimated that there are more than 10 million patients in the early days of liberation. It is the most serious parasitic disease in China.

After liberation, large-scale prevention and control work was carried out, and the situation was basically controlled. However, during the Cultural Revolution, schistosomiasis was re-endemic and spread due to the interruption of prevention efforts. It is still necessary to actively carry out prevention and control work.

Platyzoa, flukes.

It will make people lose the ability to work, and the current level of medical care is completely fine. It must be noted that people with difficult families can make you sick and impoverished. That's the harm!