Yes, but believe it or not, browser malware is not choosy and affects Linux just as well as Windows. The days of "I don't need antivirus, I use Linux" have gone.

This is even more crucial on servers. I once had my personal website infected on one hosting server (that shall not be named). I cleaned it and got reinfected within minutes. I found that other punters coplained about the same thing. The sysadmins were clearly in the "Linux is immune to viruses" school. I switched to a more clueful bunch before you could say "antivirus".