Fed up

[teethofgold]

to the original dude's issue, on the mac you can go to apple menu>about this mac>more info to access the system profiler.

from there look through your USB device tree. according to access, the virus needs to be on a dedicated USB bus. just because they are separate physical ports doesn't mean they are separate busses, as often there are internal hubs for USB (where the two ports on the front are one bus, and the two on the back are another, for example).

try experimenting with plugging stuff into different ports to see if it makes a difference, all the while monitoring using the system profiler.

for a simple test, plug the virus into one and a mouse into the other, at which point you can confirm if the virus works... then perhaps you can get an external usb hub (cheap) for your other devices.