Mac Virus: Trojan horses - Scary?

a friend shared this worrying message that "Mac OS can be hacked by viruses as well"...
I was thinking? Is it really going to affect me? I am not even bothered by the Windows OS viruses... it sounded really interesting to find out about it.

Here goes the article: Trojan Horse targets Mac OS X
It sounded that the virus in Mac is so intelligent to trick the users. Does that mean the viruses are categorized in classes already. This is sort of high-end/class virus. so interesting!

However, this is another piece to respond to that article in its own way:
Why should you be concerned about the virus? It tells you how likely you can get infected. +)
It's about Mac OS X viruses and Trojan horse.

Back to the virus topic, it all started with pornography sites. If you can just control your appetite on the website a little bit while surfing the net. I guess you are not going to get even close to infection!
Take care!