The pathogen is erysipelothrix erythraea, which has strong resistance and can survive in soil for a long time, and high temperature can kill people.

Gram-positive bacilli were isolated at first, but they may become negative after continuous artificial culture. This kind of bacteria can endure for 3 weeks in dry environment, survive for several months after freeze-drying, and can be isolated from the corpse 7 months after death. The bacteria can be killed at 50℃ 15-20 minutes and at 70℃ for 5 minutes. 1% bleaching powder, 3% chlorhexidine, 1% mercuric chloride, 1% soda water and 5% carbolic acid can kill this bacterium for 5- 15 minutes.

epidemiology

Both geese and ducks can be infected artificially and naturally, especially 2-3 weeks old ducks, and there are few adult ducks. The occurrence of this disease is not seasonal, but sporadic. Pigs are a dangerous source of infection of this disease. Ducks get this disease because they eat feed, drink water and sick fish by mistake, and they are infected through the digestive tract. Ducks come into contact with domestic animals such as pigs, and can also be infected through mucous membranes or broken skin.

Clinical symptoms The sick duck's body temperature rose to 43.5℃, listless, stopped eating, loose feathers with diarrhea, shortness of breath and refused to eat feed. The course of the disease lasts about 3-4 days, and then dies. Some ducks become weak and their joints swell, and erysipelas are separated from the swollen joint fluid.

Deconstructing symptoms

Autopsy showed that the spleen of the sick duck was obviously swollen like an egg, black and purple, and there were bleeding spots on the epicardium, resulting in muscle bleeding in the adult duck.

preventive measure

1. Duck sheds should be kept dry and cleaned frequently.

2. The venues and utensils of duck farms should be disinfected frequently.

3. Ducks should not be kept in the same circle (group) as pigs to prevent ducks from being infected with this disease.

Animals or fish products used for ducks should be cooked. Ok, feed the granular compound feed.

therapeutic method

Once a sick duck is found, it should be isolated immediately. At present, penicillin is still effective in treating this disease and can be used in large doses. Each adult duck uses 200,000 units twice a day until the body temperature drops to normal and the appetite recovers, lasting 1 ~ 2 days. Anti-erysipelas serum is effective in treating this disease, but it is not easy to buy and expensive.