What are the routes of transmission of African classical swine fever? Which areas and farmers need to pay attention to?

Recently, under the influence of African classical swine fever, pork prices across the country are also rising, and many pig farmers are also affected. So what are the routes of transmission of African classical swine fever? Which areas and farmers need to pay attention to?

I. pathogen transmission route

African classical swine fever is mainly transmitted by mouth or by sucking blood by insects through contact or ingestion of articles contaminated by African classical swine fever virus. It can be transmitted by air in a short distance, and contaminated feed, hogwash, leftovers and meat scraps, fence houses, vehicles, utensils and clothing can spread the disease indirectly. Ticks can be transmitted either by mating or vertically. In addition, blood-sucking insects, such as mosquitoes and mosquitoes, can transmit African classical swine fever virus from infected pigs to healthy pigs through bites.

The possible way for African classical swine fever to be introduced into China is the highest risk of meat products contaminated with the virus through international trade and personnel exchanges. In addition, introduction and wild boar activities may also lead to the introduction of the epidemic.

International trade and personnel exchanges. With the continuous development of China's reform and opening up and the continuous improvement of the level of economic development, the number of foreign tourists entering China or Chinese tourists traveling abroad is increasing year by year. Inbound tourists, returnees, and international parcels may bring contaminated pork or pork products to China from the affected countries; if the food waste from international flights, aircraft, ships, and so on from the affected countries is not treated, it may also cause an epidemic after being exposed to domestic pigs for food. Cases of cross-border transmission of swine fever in Africa in this way are very common, and the outbreaks in Eastern Europe were brought in through an international cargo ship docked in Georgia. at that time, the ship carried swill that contaminated African swine fever and was fed to pigs near the port.

Introduction. One of the important ways to introduce breeding pigs is that breeding pigs with virus can carry virus latently and enter China with the introduction. African classical swine fever virus in frozen semen of pigs can survive for a long time and can be accompanied by artificial insemination to spread the virus to sows and cause outbreaks.

Wild boar activity. China has a vast territory and is rich in wild boar resources, especially in the areas bordering Russia. Wild boars can move back and forth near the border between the two countries. Once an epidemic occurs on the Russian border, there is also a great risk of being introduced into China through wild boar activities.

2. After the outbreak of the epidemic in the risk area, based on the principles of proximity of time and space and giving priority to risk, the following areas should focus on:

Key areas: Beijing, Tianjin, Hebei, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Gansu, Xinjiang and so on.

III. Farmers who need to pay close attention to

1. Recently, farms with sick and dead pigs, especially those with weak body, decreased feeding, lethargy, high body temperature, or increased eye and mouth secretions. two。 Newly purchased live pigs without quarantine of origin or unknown origin. 3. An area where swill is fed, especially uncooked hogwash. 4. Those with a poor level of biosafety, such as outdoor pig stocking, captive breeding without disinfection facilities / measures, and breeding sites close to traffic roads. 5. Recently, pig traders from key areas have entered the market to buy pigs or recently engaged in trading activities in the pig market.