Duck viral hepatitis is an acute infectious disease with a rapid spread and high mortality rate, posing a serious threat to ducklings. The causative agent is the duck hepatitis virus, which can occur all year round, but its outbreak peaks in winter or early spring. The infected ducklings are mainly ducklings under 3 weeks of age, and adult ducks can also be infected but do not get sick, but are carriers of the disease. The feces, blood, liver, etc. of sick ducks may become the source of infection, and they can be transmitted through feed, water, personnel and other vectors. 
The symptoms of sick ducks are very obvious, the liver is enlarged, brittle, pale red or mottled, there are bleeding spots or hemorrhagic spots on the surface, and sometimes the liver will have necrotic foci. Sick ducks often lose appetite, listlessness, sluggishness, head arching, eyes half-closed in a coma, some sick ducks have diarrhea, followed by neurological symptoms, such as uncoordinated movements, head back, wings drooping, dyspnea, etc. Before death, the head and neck of the sick duck will twist, and the legs will be stretched out and spread back, forming a posture of angular arch reflexion, which is typical of the death of the disease. 
For the prevention of duck viral hepatitis, first of all, we must do a good job of sanitation and disinfection, strict sanitation and disinfection of the hatchery, duck house and surrounding environment, and do not introduce ducklings from duck farms with a history of disease. The second is immunization, using duck viral hepatitis vaccine for primary immunization and booster immunization. Breeders are vaccinated multiple times before laying eggs to ensure that their antibodies can be passed on to their offspring.
*The method is mainly to use **duck serum or high free serum for subcutaneous injection, or to add nutrients such as vitamin C or instant multivitamin to drinking water. It can also be carried out with Chinese herbal formulas, such as banlan root, large green leaves, gardenia, astragalus and other herbs decoction and then give it to sick ducks to drink. In addition, the entire duck house is disinfected to prevent the spread of the virus.
In conclusion, for the acute infectious disease of duck viral hepatitis, prevention and ** are very important. Farmers should strictly manage the breeding environment, do a good job of sanitation and disinfection, carry out scientific immunization, and timely find and isolate the best sick ducks to ensure the health and production benefits of the ducklings.