Abstract:Influenza can cause a global pandemic. Flu-causing pathogens are segmental RNA influenza viruses, which circulate in the population every year and cause seasonal influenza. The virus often causes the "drift" variation of antigen in the epidemic process, which is one of the main causes of death in the elderly and other high-risk groups. Therefore it’s necessary for WHO sets monitoring sits in global for detection and analysis of the epidemic strains, preparing a candidate vaccine strain for seasonal influenza in nest year.
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