The pathogen of porcine pulmonary filariasis is a roundworm, which is white filamentous (so called pulmonary filaria), with a body length of 1.2 cm to 5.1 cm, which is parasitic in the bronchus of pigs. Since cockroaches are intermediate hosts, there is a prevalence of this disease in places where cockroaches live. Especially in the hot summer rainy season, the soil is fertile, the soil is dirty, and the unsanitary environment is more likely to occur. The disease mainly occurs in piglets and young pigs. Sick pigs gradually lose weight, anemia, cough, nasal mucus, shortness of breath, pigs grow slowly, and severe pigs can cause death. Although the lungs are parasitic in the pig's trachea, the eggs are excreted and infected from the digestive tract. It is because the eggs laid by the females parasitic in the bronchus, when the pig coughs, the sputum is swallowed into the digestive tract through the trachea and throat, and is excreted in the soil with the feces. If the eggs are swallowed by the cockroaches, after 10 days~ It can develop into larvae with infectious pathogenicity in 20 days. Once infected by pigs with infectious larvae, they will be infected. After the cockroaches are digested, the larvae penetrate the intestinal wall into the lymphatic circulation and then enter the anterior vena cava, enter the right heart vein to reach the lungs, and finally enter the bronchial development into adults. It usually takes about 25 days to 35 days from the swallowing of pigs to the development of adults. In this way, from the pig to the cockroach, and then from the cockroach to the pig, the viciousness is not only circulating, but also harmful to the pig. Fecal examinations are carried out on pigs every year in the spring and autumn. The pigs are infected or mildly infected, the clinical symptoms are not obvious, and it is not easy to detect. Therefore, a general survey is needed. For postpartum piglets, the feces should be checked at any time. The stools are small, elliptical, light gray, thick and rough, and the eggs are 40 to 54 micrometers long. The worm can be laid once. The practice of captive pigs in the free-range, defecation everywhere, will expand the spread of eggs, and it is easier to swallow and infect when it is grazing or drinking in low-humid grass. Therefore, the free-range should be changed to captivity. Harmless treatment of fecal pulmonary filariasis pigs discharge feces with eggs, should do a good job of environmental sanitation, regularly clear out to the septic tank, the implementation of high temperature accumulation fermentation to eliminate the source of infection. Drug prevention In order to prevent pigs from suffering from pulmonary filariasis, diphenylamine sulfide can be used for prevention. The dithiol sulfide acts on the thiolase in the worm, which can cause the worm to paralyze and die, and its effect is mild and long-lasting. The amount of pig used is 0.2 g to 0.5 g per kilogram of body weight. Use bismuth sulfide to form a 5% solution, such as can be mixed with 0.1% hydrochloric acid to feed the mixture better. The eggs can be removed from the larvae hatched in the digestive tract and the source of infection can be cut off. Regular insect repellent medication regularly fight insects, can take albendazole 5 mg / kg body weight ~ 10 mg / kg body weight. Or use Deworming Net Injection 7.5 mg / kg body weight ~ 12 mg / kg body weight, intramuscular injection, one injection after one week interval, oral dose of 15 mg / kg body weight ~ 25 mg / kg body weight. For pigs in the early stage of infection, oral administration of hexamine can be taken orally at a dose of 200 mg/kg body weight. Repelling pig lung filars. Recently, the veterinarian used tracheal injection with dilute iodine, and used 1500 ml of sterilized distilled water with 1 g of iodine and 1.5 g of potassium iodide. In the preparation, the iodine tablets, potassium iodide and a small amount of distilled water are firstly hydrolyzed, and then sufficient distilled water is added for tracheal injection. The big pig has 15 ml of lungs on one side and 8 ml of piglets. Severely ill pigs should be injected on both sides of the lungs at intervals of one day; healthy pigs can be injected simultaneously on both sides of the lungs. However, the injection can not take the standing position, otherwise the therapeutic effect will not be achieved. Should be taken to the side, that is, the pig body and the ground at an angle of 30 degrees. Only in this way can the iodine solution flow to the trunk of the main airway, because the place where the lung filars accumulate the most, that is, the medicine can be eliminated. Tracheal medication is also injected with sodium salicylate. 5 grams of sodium salicylate and 100 ml of distilled water, after injection, inject into the trachea, 20 ml of large pigs, 10 ml ~ 15 ml of piglets, one-time tracheal injection. Qingzhou JuLong Agriculture Equipment Co.,Ltd , https://www.julonggrowtech.com