Prevention and treatment of porcine rotavirus disease

Porcine rotavirus is an acute intestinal infectious disease caused by porcine rotavirus. the main symptoms are anorexia, vomiting and dysentery. Medium and big pigs are recessive infections without symptoms. In addition to porcine rotavirus, rotaviruses isolated from children, calves, lambs and foals can also infect piglets and cause varying degrees of symptoms. Let's take a look at the prevention and treatment of porcine rotavirus.

Epidemic characteristics of porcine rotavirus disease

Rotavirus mainly exists in the digestive tract of sick and infected pigs. After excreting feces to the external environment, it pollutes feed, drinking water, grass and soil, and makes pigs susceptible to infection through the digestive tract. The detoxification time can last for several days, which can seriously pollute the environment, coupled with the indomitable resistance of the virus to the external environment, so that rotavirus can be repeatedly infected among adult pigs, middle pigs and pigs, and take root in pig farms for a long time. In addition, people and other animals can also spread infection. Most of them occur in late autumn, winter and early spring. Pigs of all ages can be infected. In endemic areas, most adult pigs have been infected and have acquired immunity. Therefore, most of the sick pigs are piglets under 8 weeks old, and the younger the piglets are, the higher the incidence is, the incidence is generally 50-80%, and the case fatality rate is generally less than 10%.

Clinical symptoms of porcine rotavirus disease

The incubation period of porcine rotavirus disease is generally 12-24 hours. It is often endemic. Early depressed spirit, loss of appetite, unwilling to move, some after breast-feeding vomiting, followed by diarrhea, feces are yellow, gray or black, watery or paste. The severity of symptoms is determined by the age of onset, immune status and environmental conditions. Piglets without maternal antibody protection have the most serious symptoms. When the ambient temperature decreases or secondary colibacillosis occurs, the symptoms are often aggravated and the mortality is increased. Usually, the symptoms of 10-21-day-old piglets are mild, diarrhea can be recovered in a few days, 3-8-week-old piglets have milder symptoms, and adult pigs have recessive infection.

Prevention and control measures of porcine rotavirus disease

1. Treatment: there is no specific treatment for porcine rotavirus disease at present. It was found that the milk was stopped immediately and the diseased pigs were given free drinking with grape saline or compound glucose solution (glucose 43.20 g, sodium chloride 9.20 g, glycine 6.60 g, citric acid 0.52 g, potassium citrate 0.13 g, anhydrous potassium phosphate 4.35 g dissolved in 2 liters of water). At the same time, symptomatic treatment, such as the use of astringent antidiarrheal agents, the use of antibiotics, in order to prevent secondary bacterial infection. Generally, good results can be obtained.

2. Prevention: the prevention of porcine rotavirus disease mainly depends on strengthening feeding management, conscientiously implementing general veterinary epidemic prevention measures, and strengthening resistance. In endemic areas, sows or piglets can be vaccinated with rotavirus adjuvant inactivated vaccine or porcine rotavirus attenuated bivalent vaccine. The oil adjuvant vaccine was injected intramuscularly with 2 ml 30 days before delivery in pregnant sows. The piglets were injected once at the age of 7 days and 21 days respectively, and the injection site was subcutaneously at Houhai acupoint (between the caudal root and anus), with 0.5 ml each time. The attenuated vaccine was injected intramuscularly at 5 and 2 weeks before labor, with 1 ml per head. At the same time, newborn piglets should eat colostrum early and be protected by maternal antibodies so as to reduce the incidence of the disease and weaken the disease.