First, popular features
The disease occurred in shelf pigs 2 to 6 months old. Sick pigs and infected pigs are the main source of infection. The main route of infection is the digestive tract. It can also be infected through skin wounds or spread by blood-sucking insects such as mosquitoes and flies. The disease can occur throughout the year.
Second, symptoms and lesions
The disease can be divided into acute type, subacute type and chronic type.
The acute type is the septic blood type. The body temperature of the sick pig suddenly rises above 42°C, and it is not eaten. The gait is unstable and even lying in the ground. Conjunctival hyperemia, bright eyes and gods. The erythema appears on the skin of the chest, abdomen, and the inner side of the femoral body. The finger pressure easily fades, and redness is restored. Short course of the disease, sudden death, mortality rate of 80% to 90%, or into rash or chronic type. When swine erysipelas occurs in suckling pigs and pigs that have been weaned, they are generally suddenly affected, have neurological symptoms, and twitch down to death. The duration of disease usually does not exceed 1 day.
The initial body temperature of subacute type disease rises to about 41°C, and the appetite is lost and constipation occurs. 2 to 3 days after the chest, abdomen, shoulders, back and limbs, etc., there are obvious boundaries of rash, block-shaped, diamond-shaped or round, slightly protruding from the surface of the skin, a diameter of about a few centimeters. Hard to touch, the light faded after a few days, self-healing, and heavy form a brown red mink unchanged. Some turn to sepsis or chronic. The disease duration is 1 to 2 weeks and the mortality rate is low.
Chronic type pigs have inflammation, swelling and lameness in the limb joints; endocarditis suffers from difficulty in breathing, visible mucous membranes, weak constitution, slow growth, long duration, and less death. The necropsy showed fibrinous exudates in the joint cavity; cauliflower-like vegetation was visible on the surface of the heart valve.
Third, the diagnosis
According to the epidemic characteristics, clinical symptoms and necropsy changes can make a preliminary diagnosis. Untypical symptoms require laboratory tests.
Fourth, prevention and control measures
1. Vaccination (1) inactivated porcine erysipelas bacterin: subcutaneous or intramuscular injection of inactivated aluminum hydroxide seedlings, immunized with 5 ml for 1 to 6 months. (2) Erysipelas attenuated live bacterin: use GC42 attenuated bacterin according to the prescription of the bottle and add 1ml of 20% aluminum-rubber saline to dissolve, 1ml subcutaneously, 2ml per head, and the immunization period is 6 months. (3) Injection of swine fever, swine erysipelas, porcine live-disease triple-live vaccine or swine erysipelas, fluoxetine aluminum dihydrate inactivated bacterin, the same immune effect as single seedlings.
2. Drug treatment (1) Amoxicillin powder injection, intramuscular injection of 15 mg per kg body weight, 1 or 2 times a day, once every 2 to 3 days. (2) Penicillin, intramuscular injection of 20,000 units per kilogram of body weight, twice a day for 2 to 3 days. (3) Ornioptic cephalosporin injection, 20,000 units per kilogram of body weight, 1 needle can maintain 9 days of efficacy. (4) 10% sulfadiazine sodium injection, 20 ~ 40 ml intramuscular injection per head per day, 1 or 2 times a day. (5) The efficacy of anti-boar erysipelas serum is also good.
3. Strengthen feeding and management (1) Do a good job of pen and environmental sanitation and regular disinfection. (2) Pigs are not imported from the affected area. Newly-purchased pigs must be observed for two to four weeks in isolation before they can enter the herd. (3) Strict quarantine system to prevent all poisonous animals and pollutants from entering the herd.
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