New manifestations of Pig epidemic

With the development of the industry in China, the gradual increase of exotic pig breeds and the continuous improvement of the degree of intensive production have led to new changes in the epidemic situation of pig disease, which should be paid enough attention to.

1. With the influx of many foreign pig breeds, new diseases are coming one after another. In 2001, porcine eperythrozoonosis was prevalent, in 2002, porcine blue ear disease was prevalent, and in the second half of 2002, ringed Z virus broke out.

2. The seasonality of the disease is gradually desalinated. Diseases that used to be seasonally prevalent are now less seasonal. Foot-and-mouth disease, for example, used to occur in winter, but now it occurs all year round.

3. With the continuous increase of variant virus (bacteria) strains, the prevention and treatment of diseases is becoming more and more difficult. With the continuous occurrence of different immune sources among new strains, the epidemic prevention effect of existing vaccines becomes uncertain, and the drug resistance of new strains to existing drugs is increasing.

4. the virulence of the virulence (bacteria) strain is weakened, and the symptoms are becoming more and more turbid. Some viruses (bacteria) also form a symbiotic relationship with the body, showing that there is no disease, and the introduction of new susceptible groups will cause a serious outbreak of the disease and cause great economic losses.

5. The complication of the disease. At present, there is almost no infection in pigs caused by a single disease, which is generally characterized by mixed infection or secondary infection.