n.

1. 傳染；侵染[U]
   Are you sure there is no danger of infection now?

   你敢不敢肯定現在已經沒有傳染的危險了？

2. 傳染病[C]
3. 影響；感染[U]
   He suffered from a lung infection.

   他肺部受到了感染。

n.

1. the process of infecting or the state of being infected.
2. an infectious disease.