Guard against Swine Influenza in Winter and Spring

Swine influenza (Swine Influenza) is an acute and highly contagious respiratory infectious disease caused by virus. The disease occurs rapidly and spreads rapidly. the incidence rate of pigs is as high as 100%, and the death rate is low. The disease is a zoonotic disease. During the epidemic period, the spread of the virus should be avoided as far as possible, and attention should be paid to the protection of breeders and veterinarians.

(1) epidemic characteristics: swine influenza mostly occurs in late autumn, cold winter and early spring. Diseased pigs, recessive infected pigs and chronic infected pigs are the sources of infection of the disease. the virus exists in nasal juice, trachea and bronchial exudates and pulmonary lymph nodes of infected pigs. mainly transmitted through the respiratory tract. It spreads so fast that it can spread throughout the pig herd in 2 to 3 days. If secondary or mixed infections of Actinobacillus pleuropneumoniae, Pasteurella multocida, Streptococcus, Diplococcus and so on, the consequences will be serious and will cause greater economic losses to the industry.

(2) Clinical symptoms: during the incubation period of several hours to several days, the whole herd of pigs fell ill at the same time within 2-3 days, and their body temperature rose to 40-41 ℃, and in severe cases as high as 42 ℃; diseased pigs were depressed in spirit, loss of appetite or even abandonment; they were unable to rise on the lying ground and were unwilling to move, and often limped when they were forced to walk. Diseased pigs have dyspnea, abdominal breathing, paroxysmal cough, mucinous purulent secretions from mouth, eyes and nose, often with blood in the secretions, flushing of conjunctiva and stagnation of growth in diseased pigs. Miscarriage often occurs in the later stage of pregnant sows.

(3) pathological changes: the mucous membrane of the respiratory tract is congested and swollen, and there is a large amount of foamy mucus on the surface, sometimes with blood. Neck, lung and mediastinal lymph node edema, hyperemia, section valgus, succulent. The pathological tissue of the lung was purplish red and atrophied, with a clear boundary with the surrounding healthy tissue. There are mucous and cellulosic exudates in the chest. Gastric mucosal congestion is severe and macular congestion occurs in the large intestine. The spleen is slightly enlarged.

(4) according to the epidemic characteristics, clinical symptoms and pathological changes, a preliminary diagnosis can be made. The disease usually occurs in early spring, late autumn, cold winter and sudden climate changes. Pigs of all ages, breeds and genders are easily infected with high morbidity and low mortality. Sick pigs show fever, cough and runny nose. The lesions were mainly concentrated in the bronchi and lungs. The differential diagnosis should be different from porcine pulmonary disease, acute porcine asthma, tuberculosis, contagious pleuropneumonia, toxoplasmosis and pulmonary filariasis.

(5) Prevention and treatment measures: the treatment principle of the disease is symptomatic treatment and control of secondary infection. Timely isolation of sick pigs, improve the feeding environment, strengthen disinfection, ensure high-quality feed and adequate drinking water, add multi-vitamin and minerals. (1) Yinhuang Reduqing injection (Jiangxi Gannan Huayi Pharmaceutical Factory) was injected intramuscularly according to 0.1ml / kg body weight and 0.15ml kanamycin at 230000 ~ 400000 IU / kg body weight, twice a day for 3 days. (2) amantadine hydrochloride tablets, orally, twice a day for 3 days. At present, there is no commercial vaccine for the disease in China. At ordinary times, we should strengthen the feeding and management, and do a good job in the environmental hygiene and disinfection of pig houses. After the occurrence of the disease, it is difficult to stop the spread in pigs. Secondary infection can only be controlled by improving feeding management, strengthening disinfection and feeding antibiotics. In order to reduce the occurrence of diseased pigs and reduce economic losses.