感染用英语单词怎么写

contagious

Happiness is contagious.快乐是可以感染的。

不知你要用在什么场合，如果是食品被感染了病毒，这样说

The food is (contaminated) with viruses.

infectious 形容词 an infectious disease
infection 名词 Flies can carry infection
infect 动词 He was already infected.

infect verb.

infection n.