Because there is no critical period for African swine fever, it only takes 2-3 days for African swine fever pigs to die quickly and 1-2 weeks for them to die slowly. Usually, pigs infected with African swine fever are found in pig farms, and should be isolated and culled immediately, and the incident should be reported to the relevant local departments so that they can send staff to handle it at home to avoid the spread of swine fever.

At present, African swine fever can pass the safety period within 45 days. According to the requirements of the prevention and control plan, after lifting the blockade, farmers who need to continue raising pigs in epidemic areas and epidemic areas can be introduced for clinical observation. After 45 days of feeding, if there is no clinical abnormality and the laboratory test is negative, they can be raised.

Pathogen of African swine fever virus

African classical swine fever virus is an important member of African classical swine fever virus genus of African classical swine fever family, and some characteristics of this virus are similar to iridoviridae and poxvirudae. The diameter of virus particles is 175-2 15 nm, which is icosahedral symmetry and encapsulated. The genome is a double-stranded linear DNA with the size of 170- 190kb.

In pigs, African classical swine fever virus can replicate in several types of cytoplasm, especially reticuloendothelial cells and mononuclear macrophages. The virus can reproduce in ticks, making it the main vector.

The virus can be confirmed from the blood, tissue fluid, viscera and other excreta of infected pigs. Viruses in blood can survive for six years in a low-temperature darkroom and for several weeks at room temperature. If infected blood is heated at 55℃ for 30 minutes or at 60℃ for 65,438+00 minutes, the virus will be destroyed, which can be destroyed by many fat solvents and disinfectants.