No, it's a bad idea. At least for now there is no need to install anti-virus software on your Mac.
Helpful Links Regarding Flashback Trojan and Virus Protection
An excellent link to read is Tom Reed's Mac Malware Guide.
A link to a great User Tip about the trojan: Flashback Trojan User Tip.
To check for the trojan: Anti Flashback Trojan 2.0.4.
A Google search can reveal a variety of alternatives on how the remove the trojan should your computer get infected. This can get you started. Or the preferred method is to use Apple's protection tool: Flashback Malware Removal Tool 1.0.
Or, open Software Update. If you do not have the Apple protection software installed it will download and install it via Software Update. If no update appears that means you either already have it installed or it isn't needed for your system. The software is only available for Leopard, Snow Leopard, and Lion versions of OS X.
Also see Apple's article About Flashback malware.
For general anti-virus protection I only recommend using ClamXav.
Hi there, I have mac running osx 105 with kaspersky internet security. All up to date. I have not downloaded anything not approved by apple and do not visit sites not approved or certificate. · days my computer was acting strange, files stops uploading on hightail. Then problems really started. I could not do a full scan, after about 3% it said scan complete, that was after 5 minutes, a full scan normally takes 1.7 hours. I opened in safe mode but kaspersky would not open message always said opening. I could not scan. I could however download files in safe so I re installed kaspersky. I then opened mac in normal mode and was able to install new virus. THEN I RAN A SCAN AND IT FOUND 2x trojen-downloader active threats. It removed them but all is not OK. I cannot access apple sites, my emails freaking out , I now cannot do full scan-I am wrting this from a PC as I don’t dare play with my Mac until the right help arrives……