This was because the pandemic virus spread faster than would be expected if there were widespread immunity to it, and because antibodies to the seasonal vaccine do not cross-react with it.
这是因为大流行病毒比预料传播更为迅速，即使对它有普遍免疫性，季节疫苗的抗体与它也没有交叉作用。
This was because the pandemic virus spread faster than would be expected if there were widespread immunity to it, and because antibodies to the seasonal vaccine do not cross-react with it.
这是因为大流行病毒比预料传播更为迅速，即使对它有普遍免疫性，季节疫苗的抗体与它也没有交叉作用。
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