The swine cricket, commonly known as the "rotten sausage," also known as the classical swine fever, is intended to distinguish it from African swine fever. Swine fever is a highly contagious viral disease that can infect pigs of all ages. It is endemic throughout the year, and has a high incidence and mortality. The disease is the most important infectious disease threatening the pig industry. The World Organisation for Animal Health (OIE) has classified swine fever as one of the 16 statutory diseases of Class A, and China has classified it as a type of infectious disease. At present, there are acute, subacute, chronic, atypical or inconspicuous forms of swine fever, which can cause great difficulties in diagnosis. ã€Pathogen】 Classical swine fever virus is a genus of flaviviruses belonging to the family Flaviviridae. It has common antigenicity with bovine mucoid disease virus and equine arteritis virus. The virus is a single-stranded RNA type, the virus particles are spherical, the nucleocapsid is sterically icosahedral, diameter 38 to 44 nm, enveloped. The virus has only one serotype, but the virus strain has strong, moderate, and weak virulence. The swine fever virus has a certain resistance to the external environment. In the naturally dry condition, the virus is easy to die. If the polluted environment is fully dried and the temperature is high, the virus will lose its infectiousness within 1 to 3 weeks. The virus can be killed by heating at 60-70°C for 1 hour, and the virus can live for months in frozen meat. Diseased bodies are rancid for 2 to 3 days and the virus is inactivated. 2% sodium hydroxide, 5% to 10% bleach, 3% water can quickly inactivate it. [Epidemiology] This disease only occurs in pigs, and pigs of various breeds are susceptible to swine fever virus. Boars can also be infected, and have nothing to do with the age or sex of the pig. After infection, pigs develop one or more hairy diseases and experience acute deaths. Afterwards, the number of affected pigs increases continuously. The epidemic peaks are reached in 1-3 weeks. After an acute passage, they tend to a low tide. The incidence gradually decreases and they are chronically passed. The epidemic ended around the end of the month. At present, the popularity of swine fever has many new features. Due to the widespread implementation of swine fever vaccination, the vast majority of swine have gained varying degrees of immunity and mild swine fever (atypical swine fever) has emerged. Clinical swine fever is less common, with more subacute and atypical swine fever, and the epidemic rate tends to ease. When the sow is infected with a weak virulent swine fever or when the sow has a low level of immunity, it can cause subclinical infections and infection of the piglet through the placenta, leading to reproductive problems in sows. Output of weakly litter, stillbirth, mummy. Piglets born to immunised sows rarely infected within 1 month of age, and their susceptibility gradually increased after 1 month of age. Large-scale pig farms usually occurred 1 to 2 months after weaning and the disease duration was 1 to 3 weeks after the disease. In the swine population reached a peak.
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