Do You Need an Anti-Virus for MAC?

It's unlikely you'll ever run into malware for the Mac

But you may still want to consider an antivirus tool anyway—if not to protect yourself, but to protect your Windows-using friends from any malware you may inadvertently send their way.

If you agree, Sophos Anti-Virus for Mac maybe the best choice, and it's free.

Many of you may choose to use nothing, but you need to consider that malware is starting to become a bit more prevalent on the Mac, and even the safest browsing habits don't protect you completely. 

Sophos Anti-Virus for Mac

Platform: OS X (10.4+) 
Price: Free
Download: Click here

Features

• Compact, easy-to-use interface that can be used for custom on-demand scans of files, folders, and drives, or scheduled, periodic full scans of your Mac.
  
• Also scans files on your Mac for known Windows malware, trojans, and viruses, and deletes or quarantines them so you don't risk spreading them to someone else via network share, USB drive, or email.
  
• Deletes or quarantines known threats, gives you the option to quarantine anything suspicious that may be a new threat or dangerous file.
  
• Runs quietly in the background, scanning emails, downloads, and any other files on access, stopping you from opening them before they can do any harm.
  
• Light on system resources while running in the background.
  
• Installs like any other Mac application, and uninstalls just as easily—no complicated packages or components to manage or configure.
  
• Sophos' "Live Antivirus" feature updates your app the moment new threats are detected or found in the wild. The feature also performs real-time lookups to see if files accessed are in the SophosLabs database, even if they're unfamiliar to the app.
  
• Supports OS X up to 10.8 and back to 10.4, and is completely free for all versions.