http://phys.org/news/2014-02-scientists-contagious-airborne-wifi-virus.html
Change your default password on the router.
:eek4:
That may be the least of your worries (http://www.bbc.co.uk/news/technology-26351123) :o
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).