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。
2
The team found no further evidence of malaria, and the test that originally detected it has since been withdrawn as it can sometimes cross-react with other substances.