Four influenza virus strains

H1N1 and H3N2 of Influenza A, and Victoria and Yamagata lineages of Influenza B are the common strains of human flu viruses. Until now, China had only three-strain vaccines on the market.


The four-strain vaccine adds protection against the Yamagata lineage of Influenza B, which as the main virus strain during the last flu season.


Two domestic companies -- Hualan and Changsheng -- are the approved vaccine producers. The vaccine may be used on adults and children aged three years and above.

2018/07/29 10:27
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