Sophos released the world's first "Free Anti-Virus Home Edition for Mac," that provides automatic detection against existing and new threats for Mac OS X. The free software also incorporates strong disinfection capabilities, capable of removing malware infections that may already be present on the Mac computer.
That means your home Macs can be protected automatically in-the-background with latest anti-virus protection, checking every program you run, every file you download, every USB stick you insert, completely free.
Sophos said "there're a growing number of bad guys out there who might consider Mac users a "soft target" and deliberately set out to infect Apple Macs, in the hope of stealing login details to banks and social networks, comandeer your MacBook to send spam or install irritating pop-ups, or simply commit identity theft."
Here're some video showing the threats on Mac:
Download: Sophos Anti-Virus Home Edition for Mac