No I'm not worried about getting a virus although I have had one before. The ancient TPLink router I was using at the time, and on which I had left the password as "admin," was compromised and both Windows and Ubuntu were infected. (This was when XP was still supported, and I had only just started using Ubuntu - probably Feb/March last year). Although I'm not sure to what extent Ubuntu was compromised, and on reflection, the damage could have been limited to Adobe flash player, although at the time I just re-installed everything. Then of course it happened again, and I finally realised that the router was the problem.
Now I have a much better router and password, so there's much less chance of that happening again.
I have F-Prot on Puppy on a USB stick, and more recently installed clamav to Kubuntu, both primarily for scanning my Windows partition. However I decided to scan Kubuntu just after I installed clamav, since it was there, and it found two Windows viruses that I had downloaded as email attachments, and subsequently forgotten about. I had saved one of them at the time so that I could upload it to VirusTotal, and the other one was still in a compressed ThunderBird directory.
But even with viruses on my computer I wasn't worried about getting infected, because Windows executable files won't execute in Linux, and Windows can't read the Linux partition that the viruses were saved on.
I also have clamav with clamtk on LXLE on my laptop, but that's only because they came with it. The only thing I've done with it so far is edit /etc/clamav/freshclam.conf and change "Checks 24" to "Checks 0", to stop it trying to update itself 24 times each day!
I'll probably keep some sort of anti-virus software on Linux for as long as I have Windows. The last time I scanned a Linux partition was the time I mentioned above, just after installing clamav when it found those two Windows viruses, which must have been at least a month ago. I'll probably scan some Linux partition at some point again, because old habits are hard to break, and using command line applications is still a bit of a novelty.
Edited by Al1000, 25 January 2015 - 12:44 PM.