influenza a virus vaccine

This year’s seasonal vaccine contains three influenza viruses — one A (H3N2) virus, one regular seasonal A (H1N1) virus unrelated to the swine flu strain and one B virus.

今年的季节流感疫苗含有三种流感病毒——一种甲型（H3N2）病毒，一种与猪流感毒株无关的常规季节性甲型（H1N1）病毒，以及一种乙型病毒。

It takes approximately five to six months for the first supplies of approved vaccine to become available once a new strain of influenza virus with pandemic potential is identified and isolated.

一旦鉴定并分离出具有大流行可能的流感病毒新毒株，大约需要5至6个月时间提供首批获批准的疫苗。

Extensive studies and data analysis of influenza vaccines have only found a well established causal association with the 1976 vaccine that contained an H1N1 swine-influenza-like virus.

经由对流感病毒的进一步研究和数据分析，只发现在1976年含有类似于H1N1病毒的疫苗存在一例具有完整因果联系的案例。