Detailed description
Epidemic encephalitis b(encephalitis b):It is an acute infection caused by encephalitis b virus and transmitted by mosquitoes. The high mortality and disability rate of encephalitis b is one of the main infectious diseases that threaten the health of people, especially children. Fall for peak season, disease epidemic areas distribution is closely related to the distribution of mosquito, encephalitis b is high endemic areas in China, in the 1960 s and early 70 s national pandemic broke out after the 70 s as a wide range of encephalitis b vaccination, je incidence is markedly reduced, in recent years to maintain in low level. And now, the number of reported cases of encephalitis b in China is between 5,000 and 10,000 each year, but there are outbreaks or epidemics in some areas. Since mosquitoes can carry the virus through the winter and can be passed from egg to egg, they are not only vectors of transmission, but also long-term storage hosts. After the mosquito infected with je bites the human body, the virus first proliferates in local tissue cells and lymph nodes, as well as vascular endothelial cells, invading the blood stream and forming viremia. The disease depends on the number of viruses, virulence and the immune function of the body. The vast majority of infected people do not get sick and have hidden infection. When the amount of invasive virus is large, virulence is strong, and the immune function of the body is insufficient, then the virus continues to multiply and spread throughout the body through blood. Because the virus has neurophilic nature, it can break through the blood-brain barrier and enter the central nervous system. In clinic, it is used for the auxiliary diagnosis of patients with encephalitis b virus infection.