Since the first case of African swine fever was discovered in Northeast my country in August last year, the disease has spread across more than half of China to the central provinces. For the purpose of early detection and early prevention and control, here is some common knowledge about this disease, especially the symptoms of African swine fever in domestic pigs at various stages.

1. Related common sense 1. It will not infect humans. Pork is the most common food on the Chinese table. When it comes to swine fever, most people may be most concerned about its harm to the human body. There is no need to worry about this, because the only host of African swine fever is pigs (including domestic pigs and wild boars), and humans will not be infected if they eat sick pigs. As long as the quarantine-qualified pork purchased through normal channels is processed by normal high-temperature cooking methods, it can be eaten with confidence. 2. Rapid spread and high mortality rate. Secondly, African swine fever is a highly transmissible disease with a mortality rate close to 100%. In a pig farm, as long as one case of sick pigs is found, the entire pig farm will suffer, and it will be wiped out. disaster. Therefore, where the disease occurs, large-scale culling is usually carried out, causing the price of pork to rise. 2. Symptoms of various stages of African swine fever In fact, the incubation period and onset period of African swine fever are very short. Once you contract the disease, you usually don’t live for 10 days, so there are no stages. Depending on the degree of clinical symptoms, it can be divided into four types: chronic, acute, subacute and hyperacute. 1. Chronic: difficulty breathing, weight loss or stunted growth, and weakness. Joint swelling, local skin ulcers and necrosis. Survival is usually several months, but recovery is difficult. 2. Acute: The body temperature rises to 42°C, listlessness, anorexia, and even diarrhea, blood in the stool and other symptoms. The skin is purple and there are bleeding spots. Pregnant sows can suddenly miscarry. 3. Subacute: The body temperature fluctuates greatly and is higher than 40.5℃ for a long time. Respiratory distress, cough, joint pain, swelling and other obvious symptoms. 4. Hyperacute: sudden asymptomatic death, approximately 8-10 days after infection. 3. How to prevent and control African swine fever. The world’s first case of African swine fever appeared in 1921. Nearly 100 years later, there is still no relevant vaccine developed. Therefore, this disease cannot be prevented and cured at present. The only way to achieve the purpose of isolation is to artificially intervene in the spread. . There are several specific ways. 1. The activity space must be disinfected in time. The space in the pig farm needs to be kept clean and disinfected every day. Other spaces where pigs move, such as pig transport trucks, feed delivery trucks, etc., must also be disinfected in time to ensure that there is no African swine fever. of germs. People entering and exiting the pig farm should also pay attention to isolation to prevent the bacteria carried by the breeders from infecting the pigs in the farm. 2. Regular food sources and ordinary cooking methods cannot eliminate the African swine fever virus in pork. Therefore, if a healthy pig accidentally eats the body tissue of a sick pig, the chance of being infected is particularly high. In the daily feeding process, pay attention to ensure that the feed and swill of the pig farm come from regular sources, and do not feed restaurant swill from unknown sources or pig feed that has not been quarantined. 3. Prevent further spread after the disease occurs. When piglets in a pig farm are found to show symptoms of African swine fever, first of all, they must not transport the pigs to other places. Secondly, they must change their clothes before leaving the pig farm, and Pack them in well-sealed bags to avoid expanding the scope of virus transmission and causing greater losses. Finally, local animal husbandry departments, epidemic prevention stations and other institutions must be notified in a timely manner to start large-scale inspection and treatment measures as soon as possible to prevent the spread. African swine fever has caused huge losses to farmers and plunged the pork market into a period of downturn. Therefore, whether it is individual breeding or large-scale breeding, it is necessary to understand the symptoms of African swine fever at each stage, deal with sick and dead pigs in a timely and reasonable manner, and do a good job in epidemic prevention and control.