Zh-hans:转变

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1. Shift 转变是指既有的H(血细胞凝集素)和N(神经氨酸酶)被另一种显然不同的H(血细胞凝集素)和Ns(神经氨酸酶)替代的过程。

注:人类免疫系统认为这些新的H或H/N组合被是新型的,因此大多数人没有既存的抗体来防护这些新病毒。这就是大流行病毒能够对人类的健康造成严重影响的原因之一。

(Source: Business Continuity Management Institute - BCM Institute)