Trichinellosis of pigs

It is caused by the adults of Trichinella spiralis parasitic in the intestine and its larvae in the striated muscle. The disease is mainly seen in pigs, rats, dogs, cats and so on are also easy to infect, but also a great harm to human beings, zoonotic parasitic disease.

1. The adult of the pathogen Trichinella spiralis is a slender nematode. The length of the male worm is 1.4-1.6 mm, and the female worm is 3-4 mm long. The larva parasitic in the muscle can reach 1.15 mm in length and curl up between the muscle fibers to form a cyst. The two ends of the cyst are obtusely fusiform, about 0.5-0.8 mm long.

The pig owner was infected by eating rats with Trichinella spiralis and diseased pork crumbs. The larvae became mature Trichinella spiralis in the duodenum and jejunum for 2 days. after fertilization, the female began to produce a large number of larvae on the 5th-6th day, and the male died after mating. The life span of the female is 25-45 days, and one female can produce 1500-10000 larvae. The larvae enter the blood through the lymph and then grow and develop into the striated muscle to form a cyst. Therefore, animals with trichinellosis are both the final host and intermediate host of Trichinella spiralis.

two。 Symptoms clinical symptoms occur only when there is a severe infection. Body temperature rises 3-7 days after infection, dysentery, and sometimes vomiting. The pig is emaciated, followed by muscle stiffness and pain, difficulty breathing, hoarse pronunciation, sometimes facial edema, dysphagia and other symptoms.

3. The common parasitic sites of muscle Trichinella spiralis were diaphragm, tongue muscle, laryngeal muscle, intercostal muscle and chest rib. The cyst is not visible to the naked eye, and the calcified cyst is a small gray nodule about 1 mm long.

4. The diagnosis was made by taking small pieces of muscle that were prone to parasitism, cut into wheat grains, thinned with slides and examined under a low-power microscope.

5. To prevent and strengthen the sanitary inspection of slaughtering, diseased pork should be reused after high temperature treatment. Extinguish the rats around the farm and burn the bodies of diseased rats. Pigs do not graze, avoid contact with animal carcasses and some insects, and do not give raw meat crumbs to pigs.

6. Treatment of albendazole, 80-100 mg per kilogram of body weight, mixed into the feed, once in the morning and evening, for 6 days.