What are the symptoms of each stage of African swine fever in domestic pigs? How to effectively prevent and control?

Since the first case of African classical swine fever was found in northeast China last August, the disease has spread across more than half of China and spread to the central provinces. For early detection and early prevention and control, the following is about the general knowledge of the disease, especially the symptoms of African classical swine fever in domestic pigs.

1. Relevant common sense

1. It's not contagious.

Pork is the most common food on the Chinese dinner table. When it comes to classical swine fever, what most people are most concerned about is its harm to the human body. There is no need to worry about this, because the only host of African classical swine fever is pigs (including domestic pigs and wild pigs), and people who eat sick pigs will not be infected. As long as the quarantine qualified pork purchased through normal channels can be safely eaten after being processed by normal high-temperature cooking methods.

two。 Rapid transmission and high mortality

Secondly, African classical swine fever is a highly contagious disease with a mortality rate close to 100%. In a pig farm, as long as one case of sick pig is found, the whole pig farm will suffer and be destroyed. As a result, large-scale hunting is usually carried out in places where the disease occurs, leading to a rise in pork prices.

II. Symptoms of African classical swine fever in different stages

In fact, the incubation period and onset period of African classical swine fever are so short that once you get the disease, you usually live no more than 10 days, so there are no stages. According to the degree of clinical symptoms, it can be divided into four types: chronic, acute, subacute and hyperacute.

1. Chronic: dyspnea, emaciation or growth retardation, weakness. Joint swelling, local skin ulcer, necrosis. It usually survives for months, but it's hard to recover.

two。 Acute: body temperature rises to 42 ℃, lethargy, anorexia, even diarrhea, blood in stool and other symptoms. The skin is purple and has bleeding spots. Pregnant sows have a sudden miscarriage.

3. Subacute: the body temperature fluctuated greatly, which was higher than 40.5 ℃ for a long time. Respiratory distress, cough, joint pain, swelling and other obvious symptoms.

4. Hyperacute: asymptomatic sudden death, about 8-10 days after infection.

Third, how to prevent and control

The first case of African classical swine fever in the world appeared in 1921, nearly 100 years later, there is still no related vaccine, therefore, the disease can not be prevented, can only artificially intervene in transmission to achieve the purpose of isolation. There are the following ways.

1. The activity space should be disinfected in time.

Whether the space of the pig farm needs to be kept clean and disinfected every day, and in other areas of pig activities, such as pig trucks, feed delivery trucks, etc., to ensure that there are no African classical swine fever germs. People going in and out of the pig farm should also pay attention to isolation so that the germs carried by the breeders will not infect the pigs in the pig farm.

two。 The source of food is regular

General cooking methods cannot eliminate African classical swine fever virus in pork, so if healthy pigs accidentally eat the body tissue of diseased pigs, they are particularly likely to be infected. In the daily feeding process, pay attention to ensure that the pig farm feed, hogwash source is regular, do not feed restaurant hogwash of unknown origin, or unquarantined pig feed.

3. Prevent further spread after onset of the disease

When it is found that the piglets in the pig farm show the symptoms of African classical swine fever, first of all, the pigs must not be transported to other places, and the second is to change their clothes before leaving the pig farm and pack them in a well-sealed bag, so as not to expand the spread of the virus and cause greater losses. Finally, it is necessary to promptly notify the local animal husbandry departments, epidemic prevention stations and other institutions, and start large-scale inventory and treatment measures as soon as possible to prevent spread.

African classical swine fever has brought huge losses to farmers and plunged the pork market into a periodic downturn. Therefore, whether it is individual breeding or large-scale breeding, we must understand the symptoms of African classical swine fever in various stages, deal with sick pigs and dead pigs in a timely and reasonable manner, and do a good job in epidemic prevention and control.