to pass a disease to a person, animal, or plant

The ward was full of children infected with TB. 病房里住满了感染结核病的孩子。

All the tomato plants are infected with a virus. 所有的西红柿植株都染上了一种病毒。

If a place, wound, or substance is infected, it contains bacteria or other things that can cause disease.

The meat had been infected by E coli bacteria. 肉被感染了大肠杆菌。

to make someone have the same feeling or emotion as you

Her optimism seemed to infect all those around her. 她的乐观情绪似乎感染了周围所有的人。

to pass harmful programs from one computer to another, or within files in the same computer

A computer virus may lurk unseen in a computer's memory, calling up and infecting each of the machine's data files in turn. 计算机病毒可潜伏在计算机存储器中，依次调出并感染计算机中的每一个数据文档。