It was sparked by an H2N2 strain and was first identified in China.

这是一种H2N2病毒引发的，并在我国首次发现。

youdao

But because H3N2 completely replaces H2N2 in people, no one born since 1968 has any immunity to H2.

但因为H3N2在人体完全取代H2N2所以在1968年之后出生的人没有一个人对H2有任何免疫性。

youdao

The virus is produced by a reassortment, in which human-adapted H1N1 swaps genes with an H2N2 bird flu.

这病毒是重组产生的，由人-适应H1N1与H2N2禽流感基因互换。

youdao