|Generally there aren't many pests that affect the Mac systems... But occasionally there is "something"...|
Bitdefender free version is useful to load and manually scan (daily or weekly?). There is the paid for version which monitors 23x7 of course.
Avast have a free version that works fine (monitors 24x7). However it often blocks MS Office/Outlook outbound emails, so one needs to disable that scanner option. Avast also tends to slow boot up; frequently updates itself and thus also can slow the system at intervals. But it does work.
I have both installed on a Mac Mini Mavericks OS, and weekly update Bitdefender and let it scan. Someimes it find pests that have slipped past Avast (usually stuff that requires windows running - I have win- 7 in a dual boot). No virus etc. utillity finds everything first time; but they usually catch up. And some utilities go after certain pests and not others.
message edited by trvlr