The pathogen of porcine lung filariasis is a roundworm nematode, and the body is white filamentous (so-called lung filariasis), and it is 1.2 cm to 5.1 cm in length and parasitizes a parasitic disease in the bronchi of pigs. Because crickets are intermediate hosts, there is a prevalence of this disease in all areas where fleas live. In particular, summer is hot and rainy, soil fertility, dirt contamination, and unhygienic conditions are more likely to occur. The disease mainly occurs in piglets and young pigs. The pigs are gradually wasted, anemic, coughing, nasal mucus, shortness of breath, slow pigs, and severe pig deaths. Although lung parasites are parasitic in pig trachea, eggs are excreted and infected from the digestive tract. Because the eggs parasitized by females in the bronchioles, 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 eaten by the quail, it will take 10 days to 20 days. The days can develop into larvae with infectious virulence. Pigs will be infected once they have eaten the larvae that have infectious larvae. After being digested, the larvae enter the intestinal wall and enter the lymphatic circulation and then enter the anterior vena cava, enter the right heart vein and reach the lungs, and finally enter the bronchus to become adults. It usually takes about 25 days to 35 days for a pig to swallow a cricket until it develops into an adult. In this way, from pigs to quails and then from quail to pigs, the viciousness is not only circulating, but also has a great harm to pigs. Fecal examination should be carried out every year in pigs in the spring and autumn pig lungworm general survey, because the pig was infected or mild infection, clinical symptoms are not obvious, not easy to find, it is necessary to do a census. For postpartum milking piglets, fecal examination should be performed at any time. After inspection of the feces, there are oval, light gray, thick shells, rough eggs ranging from 40 microns to 54 microns in length, which are lung fibril-positive pigs and should be dewormed. Can be laid. The practice of rearing pigs in free-range and defecate will enlarge the spreading surface of eggs, and it will be easier to swallow and infect when grazing or drinking in low-humidity grasslands. Therefore, free-range breeding should be replaced by captivity. Harmless treatment of fecal filariasis pigs excrete eggs with feces, should do a good job in environmental sanitation, timing out to the pit pool, the implementation of high-temperature accumulation and fermentation methods to eliminate the source of infection. Drug Prevention For the prevention of swine lung filariasis, diphenylamine sulfide can be used. Sulfurized diphenylamine acts on the thiol enzyme in the body of the insect, allowing the body to paralyze and die. Its effect is moderate and long lasting. The amount of pigs used was 0.2g to 0.5g per kg body weight. It is better to use 5% sulfuric acid to form a 5% solution and mix it with 0.1% hydrochloric acid. The larvae that hatch into the digestive tract can be destroyed and the source of infection can be cut off. Insecticides are regularly used to fight insects and can be taken from 5 mg/kg body weight to 10 mg/kg body weight of albendazole. Or anthelmintic injection 7.5 mg / kg body weight ~ 12 mg / kg body weight, intramuscular injection, once a week interval after injection, oral dose of 15 mg / kg body weight to 25 mg / kg body weight. For diseased pigs at the initial stage of infection, guanosine hydrochloride can be used intramuscularly at a dose of 200 mg/kg body weight. The removal of swine lung filarial, veterinary use of dilute iodine for tracheal injection, iodine 1 g, potassium iodide 1.5 grams of distilled water 1500 ml of sterilized, when preparing the first iodine tablets, potassium iodide plus a small amount of distilled water hydrolysis, and then add enough distilled water Tracheal injection. Big pigs had 15 ml of lungs on one side and 8 ml of piglets. Pigs on both sides of a diseased pig should be injected at intervals of one day; healthy healthy pigs can be injected with both lungs at the same time. However, the injection can not take the standing position, otherwise it can not achieve the therapeutic effect. Should take the side of the back, that is, the pig body and the ground into a 30 degree angle. Only in this way can the iodine solution flow to the main trunk of the main trachea, because the place where the lung filaria accumulates most, ie the medicine can be eliminated. Tracheal drugs are also injected with sodium salicylate. 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