quoting post from royaruk:
In light of the latest Trojan scare, has any-one any recommendations??
Firstly I'd check whether you were affected by this trojan, I wasn't.
If you've concerns turn off Java (and enable manually when essential) and install a program called little snitch which monitors outgoing connections on your system.
I've had far more problems with AV software over the years than viruses so I'm not yet ready to install them on my Macs.