Flu is highly infectious.

流感的传染性很高。

《牛津词典》

But when it has, the bird flu has proved to be a highly infectious and potent disease, that is fatal 60 percent of the time.

但这种禽流感病毒已经被证明是一种高传染性且强有力的疾病，60%将是致命的。

youdao

But when it has, the bird flu has proved to be a highly infectious and potent disease, that is fatal 60 percent of the time.

但这种禽流感病毒已经被证明是一种高传染性且强有力的疾病，60%将是致命的。

youdao