Not really needed but you can still pass them on through email and such. I read somewhere there are like over 80,000 variants of windoze viruses and only a couple dozen for Linux with only one that has not been patched up, rootkit I think is the one that you have to watch for.
All in all, you have more to fear from passing one on than getting a infection yourself. Windoze viruses will not run on Linux unless you are using wine and from what I have read it will only infect wine and not the Linux part.
I don't use windoze at all but I am very carefull with what I forward to family and friends since they use winderz. No need passing on something that I can stop here.
I use f-prot myself but the last few versions seem to take forever to scan. Not sure why they made it do that.
Later