数千人感染了这种病毒。

Thousands of people were ___infected with the virus.

那只是一个小诊所，拒绝关注一群都感染了艾滋病的年轻人。

It was only a small clinic, that refused to give attention to a group of young people all ___infected with AIDS.

蚊子可以感染人类疟疾。

The mosquito can ___infect humans with malaria.