Ascaridosis is one of the most common and dangerous parasitic diseases. Ascaride does not have intermediate hosts, it lives exclusively in the human body. The helminth eggs need to lie for a while in the earth to ripen, only then can the larvae hatch from them. This parasitic disease is dangerous because these worms, in contrast to other species, can live not only in the intestines, but practically in all organs of a person, so you need to get rid of it as soon as possible. Let us consider in more detail the development of the ascarid larva and its life cycle.
Once the eggs with the feces of the infected person have got into the soil, they must lie there for a while to ripen. But for the formation of Ascarid larvae, certain conditions must be observed. For example, you need direct oxygen access, comfortable temperature and high humidity.
Development of the ascarid larva
If the above conditions are met, on the 17th day, the ascaris larvae( in the photo) mature. But if not all conditions are met, then the eggs still remain viable, even at subzero temperatures, but in this case, naturally, the maturation period changes.
To begin the next stage of development, the egg needs to get into the human body. Infection usually occurs when non-compliance with hygiene rules, since the transmission mechanism is oral-fecal. Often, the disease caused by these parasites occurs in children and in people who are associated with farming.
Stage of migration of ascarid larvae
The larval stage of ascaris begins when the egg enters the intestine and is freed from the protective membranes. There is a so-called molt, protective shells are no longer needed. The size of the ascarid larvae is so small that they easily burrow into the intestinal walls and penetrate into the blood vessels, and migration begins. At first, blood serum becomes food for them, and then they use red blood cells, which are carriers of oxygen, as food.
What is caused by the migration of the ascarid larva? Oxygen starvation causes the parasite to migrate through the body in search of food. First they penetrate the liver, then they enter the heart and into the lungs, where there is a lot of oxygen. Accumulation of these in the lungs provokes increased mucus secretion, the patient begins to cough and coughs up parasites along with sputum. Some of them are swallowed again and already enter the intestines, where another phase begins. The migration of larvae that occurs in the human body lasts about two weeks.
Where does the ascarid larva develop?
Further development takes place already in the intestine, where the larva grows up to an adult in about two months and begins to multiply actively. It is here that the parasite has access to nutrients. The life span of an adult worm about a year, then it dead stands out with feces. Live parasites have a red color, and the dead become white. The adult female actively breeds, daily it lays up to 200 thousand eggs.
Many people mistakenly believe that the ascarid larva develops in the human body, goes through the entire life cycle, and then dies and the disease recedes. In fact, this is true, but only on the condition that a person will observe hygiene rules, otherwise the population of worms in his body will be constantly replenished, and parasites will harm the health of the patient for many years.
Cyclicity disorder of ascarids
Larvae do not always follow classical development. In some cases, the intestinal phase may not occur, the worms may linger in the liver and collapse there, due to the action of the protective cells. If it gets into the lungs, the patient can spit out most of the parasites along with sputum, and then the symptoms of the disease will be weakly expressed due to the low number of worms.
The path of passage of the ascarid larva can be non-standard, worms can begin their active development in different organs. For example, they can affect the pancreas, gall bladder, liver, heart and even brain. Parasites in the affected organ cause inflammation, they traumatize tissues, but it is not easy to recognize the disease, because it can be masked for other diseases.
How to get rid of the larvae of the roundworm? This is the right question to be addressed to a doctor if you suspect a parasitic disease. The presence of these parasites in the body is not as harmless as it seems at first glance.
The prevalence of this type of helminthiosis increases the risk of infection, especially this parasitic disease for children. Parasites can cause irreparable harm to the organs, in the absence of treatment and with massive infection, ascariasis can lead to a fatal outcome.