Human roundworm (caused by a disease – ascariasis)
The human roundworm parasitizes the human small intestine. Roundworms feed on the contents of the human intestine.
The length of the males of the human roundworm is 15–25 cm, and of the females – 20–40 cm. The males differ from the females also in that the rear end of their body (“tail”) is bent to the ventral side.
In the body of an infected person, several parasitic worms live at once, sometimes their number can reach several hundred.
Roundworms are very fertile – each female lays about 200 thousand eggs per year. Upon leaving the human intestine, the eggs develop in a moist environment, and after 9-13 days, larvae form in them. Ascaris eggs can remain viable for several years. With contaminated food or water, they enter the human intestine, where larvae emerge from them, which penetrate the bloodstream and are transported into the lungs with the blood stream, pierce the wall, then, when coughing, enter the pharynx, swallow and re-enter the intestine. Fertilized females begin to lay eggs 2–2.5 months after infection.
Pinworms (caused by the disease – enterobiasis)
In addition to roundworms, other roundworms, in particular pinworms, can parasitize in the human body. These are small worms: males 5 mm long, females 12 mm long.
At the head end of pinworms, a swelling of the cuticle is noticeable. The posterior end of the male is twisted spirally; in the female it is subulate and pointed. Pinworms live in the colon, where they feed on their contents. Females with mature eggs crawl out through the anus, causing itching, and, having laid eggs near it, die. A person becomes infected by swallowing eggs. Very small pinworm eggs can be carried by various insects, for example, flies, cockroaches. The life span of pinworms in the host’s body is about one month. After that, self-healing occurs. However, this usually does not happen due to the patient’s repeated self-infection.
Parasites poison the human body with their poisonous secretions, disrupt the digestion process. To prevent infection, you should wash your hands, fruits and vegetables, as well as iron your underwear and bed linen, preventing the possibility of the larvae getting to humans.