Cysticercus cellulosae, also known as cysticercus cellulosae, is the larva of Taenia solium, which is mostly parasitic on the striated muscles, brain and eyes of the intermediate host, and other organs are often parasitic. The mature cysticercus cellulosae is ovoid, about the size of soybean, and it is a translucent cyst with a long diameter of 6- 10 mm and a short diameter of 5 mm, and the cyst is filled with liquid. The capsule wall is thin film, with 1 round milky white nodules, including 1 inverted joints, and there are 4 suckers and protruding hooks on the head knot, which are arranged in two circles.
The adult of cysticercus cellulosae is parasitic in the small intestine of the final host (human), which is called Taenia solium or Taenia solium. It is also called "Taenia solium" because of the small hook on the apical process of its head. Adults are 2-5 meters long, sometimes 8 meters long, with 700- 1000 knots, milky white and striped. The section head saves about 1 m, and the section length and width are almost equal. The length of the node is about 1 times the width. Each pregnancy node contains 30,000-50,000 eggs, and the pregnancy nodes are discharged with feces one by one or in sections. The first segment can move, and the egg can escape because of the rupture of the longitudinal and longitudinal lines of the uterus. There are 65,438+0 hexagamete larvae in the egg.
Taenia solium adults can only parasitize in the first half of human small intestine. After eggs or pregnancy nodes are discharged with feces, they pollute the ground or food. Eggs or pregnant nodes swallowed by pigs (intermediate hosts) break out of their shells under the action of gastrointestinal digestive juice (some people think that larvae are hooked), and 1-2 days burrow into the intestinal wall, enter lymph and blood vessels, and flow into various tissues with blood to reach muscle tissues. After 20 days, the capsule wall appeared concave, and after 2 months, obvious suction cups and hooked protrusions had grown on the cephalic segment. At this time, cysticercosis is mature and contagious to people. Cysticercosis is mostly parasitic on masseter muscle, tongue muscle, diaphragm muscle and intercostal muscle, and is common in neck, shoulder and abdominal muscles, as well as visceral myocardium. It can survive in pigs for several years, and it will calcify and die after a long time. After eating raw or immature pork containing cysticercosis by mistake, the cyst wall is digested by gastrointestinal digestive juice, and the head segment enters the small intestine, which is attached to the intestinal wall with suction cups and small hooks to absorb nutrients and develop. Testicles appear on the chain for about 20 days, and mature eggs appear after 48 days. After more than 50 days, the pregnant nodes (or eggs) can be discharged with feces, starting from multiple stages and then gradually decreasing. It can drop 200 pieces every month.
Cysticercosis is a zoonotic disease. People get sick when they eat food contaminated with eggs by mistake. After suffering from cysticercosis, the following symptoms usually appear.
1, cysticercosis will spread to all parts of the body after entering the human body. However, the parasitic site, infection degree, infection time and survival rate of cysticercosis will make patients have different symptoms. Moreover, cysticercosis still has an incubation period, which spans a long time, usually between one month and five years, and the longest incubation period can reach 30 years.
2. Patients infected with cysticercosis often have symptoms such as headache, dizziness, nausea and vomiting, which is the most common symptom of cysticercosis. Some patients also have hallucinations, tinnitus, convulsions, hearing loss and other symptoms. In severe cases, epilepsy and increased intracranial pressure may even occur. If it belongs to subcutaneous cysticercosis, the patient will have nodules on his body surface.
People usually have obvious symptoms when they suffer from cysticercosis.