I learned that there was a virus on a USB stick I had brought from home at a copy shop today. I just downloaded ClamXav and scanned the USB stick and it didn't find anything. Should I run another AV program on the stick? I also have to disinfect the hard drive, suspecting that the virus is probably on there. I have a Mac Pro with 10.6.2 and realize that although there are few viruses for Macs, something is on the stick that is not being detected.