今年流感病毒流行毒株

流行性感冒，简称“流感”，是由流感病毒引起的一种传染性强、传播速度快的急性呼吸道传染病。流感病毒分为甲、乙、丙、丁四型，以甲、乙型为主。今年流感病毒中甲型H3N2毒株最为流行。
甲型H3N2毒株不是全新的病毒，但它是一个持续变异、需要常年关注的“老对手”。甲型H3N2毒株最早于1968年在香港被发现，并引起全球大流行，此后它成为季节性流行的主要甲型流感病毒株之一，与甲型H1N1和乙型流感病毒共同循环。需要注意的是，虽然H3N2这个亚型名称没变，但病毒的表面抗原会发生微小变异，这种持续不断的微小变异，导致每年流行的H3N2毒株可能都与前一年略有不同。因此，对于人体的免疫系统来说，每一季遇到的H3N2都可能是一个“似曾相识，但又有所不同”的“新”毒株。

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