WiFi virus

[Glenn]

http://phys.org/news/2014-02-scientists-contagious-airborne-wifi-virus.html

Change your default password on the router.

[Simon]

[john]

That may be the least of your worries 

[Technical Ben]

Seems like just a simulation of what would happen if all wifi got hacked.
You'd need both a way to break authentication/encryption and a payload for each pc/device (not too difficult on that part I guess).