anti virus software

I use my Macbook pro for designing and am often downloading free fonts etc and I was wondering if anyone could give me some advice on antivirus software....Mainly, do I need it and which is the best one?

Thanks

Dani

There's a Sticky at the top of the Switcher page about this:

http://www.mac-forums.com/forums/switcher-hangout/245728-official-antivirus-malware-firewall-faq.html

Great, thank you