RFGlobalnet has an article about a possible Wifi virus which propagates from one AP (access point) to another.
The University of Liverpool has set up a theoretical infection from one Wifi to another.
If a wifi system (AP) does not have good enough encryption setup, with a sophisticated password this attack could occur.
And Anti-virus programs will not protect.
The problem is that the danger has only been discovered, which means the nefarious methods are not even devised yet.
Keep you Wifi router correctly configured. Contact us for a remote Alpha scan.