SOPHOS FREE FOR MAC
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Sophos Antivirus for Apple Macs has a very good reputation, because of it's robust reliability it is used throughout UK Schools, Colleges and Universities. Sophos is a good choice for Apple security and has low impact on the overall performance of your system.
No matter what you've been told or think, Apple macs are as vulnerable to Viruses and Malware as any other computer system. Download and install a free antivirus now, better to be safe than sorry.