What are the epidemic characteristics of classical swine fever?

Classical swine fever is an acute contagious disease of pigs, which is characterized by high fever, massive internal bleeding and high mortality, but it has no direct harm to human beings.

The disease only infects pigs under natural conditions, and pigs and wild boars of different ages, sexes and breeds are susceptible, which can occur all year round. Sick pigs are the main source of infection. The virus can be transmitted through the excreta and secretions of sick pigs, blood, meat, internal organs, waste water, abandoned contaminated feed of sick pigs and drinking water. The spread of classical swine fever is mainly through contact and infection of digestive tract.

In addition, sick and attenuated sows can also infect the fetus vertically through the placenta, resulting in weakness of piglets, stillbirth and fetal mummification.

Extended data:

Discovery of classical swine fever:

On August, 2065438 1 day, a suspected African swine fever epidemic occurred in a farmer in Shenbei New District, Shenyang City, Liaoning Province. There were 383 live pigs, of which 47 were sick and 47 died. On August 3rd, it was confirmed by China Center for Animal Health and Epidemiology (National Research Center for Exotic Animal Diseases) that the epidemic was African swine fever.

20 18 12.25, two pigs in a farm in gifu county were diagnosed with classical swine fever that day, and the local government decided to cull more than 7,500 pigs. Since 2065438+September 2008, the largest number of pigs have been culled in the reported swine fever epidemic in Gifu County. The Japanese central government set up a crisis control team for this purpose, and dispatched 1600 members of the Ground Self-Defense Force to assist in pig culling and landfill. Three farms around the incident 10 km were also required to prohibit the transfer of their 1800 pigs.

On September 26th, 2020, Japan's Ministry of Agriculture, Forestry and Fisheries said that a swine fever epidemic occurred in a pig farm in Gunma County, and all the more than 5,000 pigs raised in the pig farm would be culled.

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