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It may seem strange, but you don't really need an anti-virus software on a Mac. Neverteheless, I also have two apps that I use, though very seldom. Both are on-demand software, they don't run in the background, do not require any system resources when not used.
 
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Unless you are accepting and sending Windows files to other Windows users, I wouldn't worry with loading an anti-virus program on your Mac. I do suggest installing Malwarebytes Anti-Malware for Mac (formerly known as Adware Medic). Depending on how you use your Mac, or allow it to be used by others, you have a greater chance of acquiring some form of Malware, than you do a virus that can affect your Mac, in my opinion.
 
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Unless you are accepting and sending Windows files to other Windows users, I wouldn't worry with loading an anti-virus program on your Mac.

Out of curiosity, would plain old PDF files count as this? Because I do regularly send PDFs back and forth between colleagues who I know use (somewhat crappy) Windows machines. Never thought about this before...
 
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