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加拿大1987~1988年冬季流感的发生有所减少,但仍发生一定的流感流行,其发病率有地区性差异。乙型流感病毒和甲型流感H3N2亚型病毒侵犯所有年龄组,其中以乙型流感病毒为主。近年,甲型流感(H3N2)病毒和乙型流感病毒分离的毒株已显示出与以前流行的毒株相比存在抗原变异。因此,WHO推荐的1988~1989年的流感疫苗应该
The incidence of influenza in Canada decreased in the winter of 1987-1988, but some influenza epidemics still occurred. The incidence of this disease varied by region. Influenza B and Influenza A H3N2 viruses invade all age groups, with influenza B virus predominant. In recent years, strains isolated from Influenza A (H3N2) and Influenza B viruses have been shown to have antigenic variation compared to previously prevalent strains. Therefore, the WHO recommended influenza vaccine from 1988 to 1989 should be