Main causes of Classical Swine Fever epidemic

On August 14, the epidemic of classical swine fever was confirmed in Zhengzhou, Henan Province, which is the second outbreak of classical swine fever in China recently. Although the epidemic has been gradually brought under control, there will still be sporadic cases. Classical swine fever is a kind of acute febrile infection caused by virus, and its morbidity and mortality can reach 100%. There are many reasons for the incidence of classical swine fever, most of which are due to the lack of a correct way of management in daily life. Next, I would like to introduce to you the main reasons for the prevalence of classical swine fever.

1. Introduction and quarantine is not strict.

At present, most of the large-scale farms are reserve breeding pigs purchased from outside, and according to expert experimental investigation, half of the pigs with classical swine fever are caused by reserve breeding pigs and piglets. Therefore, it can be concluded from the results of the investigation that many farms have not gone through strict introduction and quarantine when introducing and purchasing reserve breeding pigs. It led to the introduction of diseased pigs with recessive infection, which provided an infectious object for classical swine fever and brought it into the source of transmission.

2. Live pigs circulate frequently.

With the faster and faster economic development and the trend of economic globalization, free trade between us is also gradually increasing. The circulation speed of live pig and pig processing products in the country and even around the world is getting faster and faster, and the quarantine is not strict. Many pig traders slaughter and process live pig products by themselves. In order to make a profit, a large number of sick and dead pigs are used, resulting in the prevalence and spread of live pigs.

3. The quality of vaccine is not high.

Although every pig needs to be vaccinated against the disease, the current anti-disease vaccine is a vaccine produced by attenuated strain C, and the dose used abroad is 400RID, but the dose used in China is only 150RID. Due to the lack of dose, the disease resistance is not strong, which can not completely cut off the diseases caused by subclinical infection, leading to a vicious circle and accelerating the spread and infection of classical swine fever virus.

4. Improper immunization procedure.

In the vaccine immunization, we must pay attention to the impact of maternal antibodies, in the pig vaccine immunization. Pigs should be immunized once at the age of one month and twice at the age of two months. Do not take classical swine fever vaccine when sows are pregnant, as it can be fatal to fetal pigs. Pig farms in many places generally do not have the most antibody testing, and they are vaccinated on their own ideas, so they often lead to immune failure.

5. Influence of drug feed.

In addition to classical swine fever, there are some other diseases, such as gastroenteritis, pneumonia and so on, so some drugs should be used accordingly, but some drugs will inhibit the proliferation of lymphocytes in animal bodies to a certain extent, such as streptomycin, neomycin and so on. These drugs will affect the immune effect of classical swine fever vaccine. Do not misuse antibiotics or overdose, control the dosage when injecting the vaccine to affect the effect of prevention and treatment.

These are the main reasons for the epidemic of classical swine fever, of course, not only these reasons, but also diseases and nutrition. If the antibody synthesis in pigs is affected and reduces their own immunity, it can easily lead to the occurrence of classical swine fever. Classical swine fever is fatal to swine herds. As mentioned earlier, the infection rate and mortality rate of classical swine fever can reach 100%. Therefore, we must pay attention to the points made by the editor, and hope to be of some help to you.