UBC IT offers a free copy of Sophos Antivirus through their web site. Sophos protects Mac OSX computers used by faculty/staff/students:

• Protects against viruses, spyware and adware, rootkits and suspicious files and behavior
• Reduces exposure to malicious websites
• Built-in host intrusion prevention systems (HIPS), web-based script attack detection and Live Anti-Virus real-time lookups to SophosLabs' reputation database
• Keeps important data safe

Please note that Sophos now offers a free for use at home edition of their antivirus product that you can download and install on up to 10 computers. You can sign up and open an account by visiting the Sophos web site at https://www.sophos.com/en-us/lp/sophos-home-free.aspx.