What about ascariasis? Harm.. What is the stage of the main population?

The epidemic of ascariasis is extremely widespread, mainly due to:

The developmental history of Ascaris suis is simple and does not require the participation of intermediate hosts, which increases the chance of infection in pigs. Females are fertile, a female can lay 1020,000 eggs a day and night, and a female can lay 80 million eggs in a lifetime. The eggs are highly resistant to various external factors.

Ascaris suis eggs have four membranes. It has strong resistance to all kinds of external adverse factors. Poor feeding management, poor environmental hygiene, lack of nutrition, especially lack of vitamins and minerals in the feed, piglets are most susceptible to ascariasis, and the disease is more serious, often causing death.

The adult worm lays a large number of eggs, the external environment is seriously polluted, the life history of the worm ascaris is simple, the eggs need an intermediate host for the development of the outside world, and they directly develop into eggs in the infectious period, and the external resistance is strong due to the protective effect of the egg shell of the fertilized roundworm egg. In addition, due to improper fecal management, human life and production methods, poor dietary hygiene habits, etc., it has led to widespread epidemics.

The distribution of roundworms is worldwide, with about 1 in 4 of the world's population infected with roundworms.

Eating unclean fruits and vegetables has insect eggs.

Ascariasis occurs in almost all pig farms, especially in piglets. There are 3 main reasons for this:

1) The Ascaris egg wall has four membranes, which is very resistant to the external environment and chemical drugs, and can survive in the soil for a long time, and it is difficult to kill it in a short time with ordinary disinfectants.

2) The life cycle of Ascaris suis is simple, and its development process does not require an intermediate host.

3) Ascaris have a strong reproductive ability, and each female can lay 30 million eggs in her lifetime. Therefore, all pig houses and sports fields with roundworm pigs must have a large number of roundworm eggs accumulated, which has become the source of pig ascariasis infection. When poor feeding management, poor hygiene and low nutritional levels are the case for piglets to develop ascariasis.

Ascariasis exists in people between the ages of 10 and 100, you just want to say that there is no ascariasis, there is no ascariasis, there are no ascariasis patients, you usually have to be careful of this disease, otherwise it will be too late to make up for the sudden infection, once the ascariasis is infected, it will accompany you for a lifetime, you have no status, you usually do not even have the qualifications to go to prison, it is impossible to let you eat in prison for free.

1. The life history of roundworms is simple and does not require an intermediate host. 2. Ascaris lays a large number of eggs. 3. Insect eggs have strong resistance to the external environment, and can generally survive for one year on shady soil or vegetables, and have a certain resistance to chemicals such as acid and alkali in the external environment.

4. Fertilizing or defecating with human feces that have not been harmlessly treated makes the eggs widely pollute the soil and environment, and the eggs are often carried by poultry, livestock, flies and cockroaches, further expanding the scope of dissemination. 5. Poor personal hygiene habits, eating raw food, melons and fruits, not washing hands before and after meals, etc.

You can't eat anything, your stomach hurts, and your mouth hurts.

The severity of the harm of roundworms to the human body is because: ().

a.The larvae migrate in the body (

b.Adults have a drilling habit (correct answer).

c.The larvae molt in the lungs.

d.Adults rob nutrients.

e.Adults secrete toxins.