No AV software needed for Mac OS X, as there are no viruses currently in circulation, that can affect Mac OS X and all the other (a dozen or two) malware titles need to be installed manually.
Also, MRoogle will you give hundreds or thousands of threads about this issue.
Even though some might get annoyed of reading this, the thread title guy strikes again:
A more descriptive and precise thread title will help cater to the right audience and get you more responses.
To edit your thread title, just click on the
button on the bottom right of your original post and then click the "Go Advanced" button below your message.
Example: Need AV software for my new MacBook Pro - any recommendations or tips?