Case 1: At the beginning of December 2006, a farmer in Yitong County had a history of 200 fattening pigs. The sudden onset of mental depression, loss of appetite and drinking water, and serious loss of appetite. Early onset: Individual pigs had a fever and then quickly spread to most of the pigs. They had elevated body temperature, difficulty breathing, lethargy, runny nose, cough, some faeces, dry skin, reddened or purple tips, and eventually died of exhaustion.
Case 2: In mid-December of 2006, a farmer in Lishu County raised 20 sows and 10 sows who were pregnant. In the early stage of the disease, a pregnant sow lost their abortion. Other pigs showed loss of appetite or waste, elevated body temperature, and mental illness. Depression, rapid breathing, lethargy, dung, etc.
1 Popular features
The pigs of all ages are susceptible: the mortality rate of medium and large pigs is generally high, and nursery pigs, piglets, and sow herds are also affected. However, the incidence and mortality are relatively less, and they can be transported by air, pollution, Appliances and detoxification of the respiratory tract of the pigs are transmitted through the respiratory and digestive tracts.
2 clinical symptoms
Most of the affected pigs were 40-100 kg of growing pigs. The diseased pigs showed mental depression, decreased feed intake or depletion, increased body temperature to 41.5°C, difficulty in breathing, and hibernation; severe cases were abdominal breathing, shortness of breath, some breathing or irregular breathing; Runny nose, cough, increased eye discharge, and symptoms of conjunctivitis. Most of the sick pigs developed constipation. The stools were globose, and some had diarrhea. The severely infected pigs had purple patches behind their ears, abdomen and back. Pigs with a longer disease duration were pale, with rough hair, and others were yellowed. The symptoms of the pigs were reduced after using antipyretic drugs. However, most of the pigs relapsed after drug withdrawal: individual pigs could not stand before dying, and finally they died of convulsions. The mortality rate of the diseased herds is as high as 50%. Nursery pigs, piglets and sow herds have a few high fever incidences. However, the incidence and mortality are low, and the symptoms are also different. Generally, no deaths are cured after 10 days.
3 necropsy changes
The necropsy of the 5 pigs, common: 1 pulmonary enlargement, hemorrhage, diffuse interstitial pneumonia, some marble-like or patch-like, and some purulent, significantly widened interstitial, and Cellulose exudate; part of the lungs of the lung lobe showed purple, red or gray red ventral. 2 hepatomegaly, lighter color, loess, individual white necrosis, crisp. 3 The spleen is swollen, darker in color, and purple-brown in color; some edges have jagged bleeding points and are brittle. 4Hepatic and extrahepatic membranes have hemorrhage or coronary fat hemorrhage, kidney; bladder, larynx have different degrees of bleeding, most have gastric ulcers. 5Congested lymph nodes, the following mandibular lymph nodes, hilar lymph nodes, inguinal lymph node swelling were obvious, and the mediastinal lymph nodes of individual pigs were also significantly enlarged. 6 There are individual cases of serous cytoplasmic pleurisy and peritonitis, pulmonary pulp and thoracic or pericardial fibrinous adhesions, and individual myocardium adheres to pericardial or thoracic diaphragms.
4 Diagnosis
According to recent epidemiology, clinical symptoms, and necropsy changes, it was diagnosed as a high-grade fever caused by mixed infection with swine influenza virus, swine fever virus, and blue ear virus.
5 Prevention measures
5.1 Improve the nutritional level of the feed and increase the disease resistance of the herd.
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