The low efficiency of breast milk transmission is due mostly to the small amount of infectious virus in milk.

哺乳传播的低概率是因为母乳中病毒含量很低。

youdao

The low efficiency of breast milk transmission is due mostly to the small amount of infectious virus in milk.

哺乳传播的低概率是因为母乳中病毒含量很低。

youdao