In summer, the temperature is high and the humidity is high. Many viral diseases, bacterial diseases and parasitic diseases in pigs are easy to occur and spread, posing a great threat to the pig industry. First, frequent onset and treatment In addition to swine fever, swine flu, piglet paratyphoid, haemophilus, erythroblastosis and toxoplasmosis, the frequent occurrence of summer pigs must be highly valued by pig farmers. 1, swine streptococcosis Often after the pig has a cold and fever. In acute pigs, the body temperature rises above 41 °C, reducing or stopping eating, conjunctival flushing, and runny nose. Some sick pigs develop arthritis, limp, crawling or unable to stand; some show signs of ataxia, empty mouth molars and other neurological symptoms; some neck and other areas of the skin are extensively hyperemia or blood spots. Piglets in 8 weeks of age often die within two days. Chronic sick pigs often have large pale rosettes on the head, chest, abdomen and femoral skin, and are covered with brown suede. When mixed with swine fever, the pig has a fluid nasal fluid, ear tip, abdomen, extremities, and the inside of the femur with purple-red or blue-violet bleeding spots and bleeding spots. The sick boar can see urine accumulated in the foreskin and squeeze out a white, turbid, foul-smelling liquid. The sick pigs have constipation after diarrhea or constipation diarrhea alternately, and later breathing difficulties, often 1-3 days of death. In recent years, the pathogen of this disease has developed resistance to a variety of antibiotics, which has made it difficult to clinical treatment. However, if intramuscular injection of amoxicillin (15 mg per kilogram of body weight), 2.5% enrofloxacin injection (2.5 mg per kilogram of body weight), once a day for 3 days, the condition will wait until effective control . When mixed with swine fever, a full group of emergency vaccination against swine fever rabbits is also required. 2, pig erythrocyte disease Its typical clinical symptoms are decreased sow production performance, poor piglet constitution, anemia, intestinal and respiratory infections. The fattening pigs have a mental illness at the beginning of their illness, and their body temperature rises to 39.5-42 °C. They tremble or turn around or are unwilling to stand. They are lying in the ground and appear constipation or diarrhea. The skin of the sick pig's ear, the lower neck, the chest, the abdomen, and the inner side of the limbs are red and purple, and the finger pressure does not fade, becoming a "red pig". Although there are many drugs for treating this disease, there are not many drugs that are really effective. Bloodworm net, imidazophenone, neodymium vanamin, tetracycline, oxytetracycline and the like can be used. 3, swine toxoplasmosis Clinical manifestations like flu, body temperature rose to 40.5-42 ° C, missed fever, manifested as difficulty breathing, abdominal breathing, cough, runny nose, limb and muscle pain, stiffness, the inside of the limbs, the subcutaneous area of ​​the abdomen Reddish purple. The surface lymph nodes are enlarged and treated with sulfa drugs such as sulfamethoxazole, sulfadiazine and trimethoprim. Second, the cause 1. Improper feeding and management For pigs raised in open or semi-open pig houses, the overheated ambient temperature tends to stress the pigs and disrupt the body's normal metabolism. In a closed pig house, the harmful gas is often seriously exceeded due to poor ventilation. If the humidity is high, it will facilitate the reproduction of pathogenic pathogenic microorganisms and create conditions for the occurrence of the disease. 2, poor feed quality Such as the feeding of mildewed and deteriorated feed, etc., will cause a variety of pathogenic pathogenic microorganisms to take advantage of. 3. High temperature, high humidity, and dramatic weather These factors are conducive to the breeding and reproduction of pathogens, and become an important cause of the epidemic of swine disease in summer, and some of these diseases are induced and secondary infections after the body's resistance is reduced when the cold is cold. 4, summer mosquitoes, flies, cockroaches and other blood-sucking insects promote the occurrence of swine plague and the prevalence of rural household pig houses without gauze to prevent mosquitoes, flies, cockroaches is a very common phenomenon. 5, artificial communication Such as the flow of people, the grazing of pigs, especially the sale of sick and dead pork in the market, so that the disease spread widely. Third, comprehensive prevention and control measures First of all, we must strengthen the management of feeding, pay attention to heatstroke prevention and cooling, do a good job in environmental sanitation, and regularly disinfect the environment and utensils. Secondly, we must pay attention to eliminating blood-sucking insects. In addition to using drugs to kill, we can install gauze in the pig house, which can effectively prevent the bites of mosquitoes, flies and cockroaches and reduce the occurrence and spread of diseases. Third, after the onset of the pig, the cause should be identified in time, treated as soon as possible, and the dead pig should be buried or incinerated. 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