caused by a virus

viral infections 病毒感染

used to describe something that quickly becomes very popular or well known by being published on the internet or sent from person to person by email, phone, etc.

Here's a list of the top ten viral videos this week. 以下是本周十大病毒式传播的视频。

Within days the film clip went viral. 几天内这段电影视频便病毒式地传开了。