Clinical diagnosis and prevention of swine dysentery

Porcine dysentery, also known as blood dysentery, black dysentery, mucous hemorrhagic dysentery and so on, is a unique intestinal infectious disease of pigs caused by short spirochete of swine dysentery, characterized by emaciation, diarrhea, mucous or mucous hemorrhagic dysentery. The pathological features are catarrhal, hemorrhagic, fibrous or necrotizing cecum and colitis.

The occurrence of the disease is non-seasonal and can occur in pigs of all ages, but it is common in 2-3-month-old pigs with high mortality. The disease spreads slowly, lasts for a long time, and is mainly acute at the beginning. Most of the diseased pigs show waste food, severe dysentery, gray soft stool or watery diarrhea, and the feces contain a lot of mucus or blood silk and blood clots. Then the feces contain fragments of blood, mucus and white mucosal fibrous exudates, which smells fishy. Some diseased pigs excrete red and white gel or blood stool, depressed spirit, incontinence, hanging abdomen and loss of appetite. Increased craving, weakness, emaciation, ataxia, and finally died of exhaustion. After 3 weeks, it was mainly chronic type, sometimes mild and sometimes severe dysentery, black-red blood and mucus (such as greasy) in feces, normal or slight loss of appetite, progressive weight loss, anemia and growth retardation in pigs. a few recovered pigs will relapse after a period of time.

During autopsy, acute type pigs showed mucinous and hemorrhagic inflammation of large intestine, chronic type pigs showed necrotizing colitis, and there were no significant changes in other organs.

Main points of prevention and control: first, adhere to self-breeding and self-cultivation, and it is strictly forbidden to introduce species from epidemic areas. Second, strengthen feeding and management, do a good job in cleanliness and hygiene, keep the enclosure clean and dry, implement the all-in-all-out system, isolate or eliminate diseased pigs in time, and manage fecal and urine treatment in combination with disinfection. Third, according to the relevant research data, pigs vaccinated with subunit vaccine containing hemolysin can obtain protective immunity, which is sufficient to prevent the occurrence of clinical symptoms and pathological changes of porcine dysentery. Fourth, drug purification. (1) medication for treatment. With 0.5% dysentery net intramuscular injection, pigs were injected with 2ml per kilogram of body weight, ordinary pigs were injected with 5ml, growing pigs were injected with 10ml, and fattening pigs were injected with 20ml twice a day for 2 days. Gentamicin can also be injected twice a day with 2000 international units per kilogram of body weight per day, followed by preventive drugs for 5 days. (2) Preventive use of drugs. 1. It is used for asymptomatic pigs in the same column. Neomycin sulfate 0.1 grams per kilogram of body weight per day can be taken for 3 days for 5 days. You can also use trimethoprim (TMP), 0.02g per kilogram of body weight per day for 5 days as a course of treatment. two。 Used to assume a health group. You can use dysentery 0.01 grams per kilogram of body weight per day and feed it with mixture for 5 days. Can also use dysentery net per kilogram of body weight of pigs per day with 5 mg of medicine, mix feed, continuous feeding for 5 days. In addition, carbazol and lincomycin are effective in the treatment of porcine dysentery.