PS3 Anti virus?

Hi

I got a Playstation 3 for xmas and have the internet up and running fine but i was wondering about anti virus? what shall i get. I have full protection on the computer but obviously that wont do for the ps3

Help

Thanks
Update: ok sorry im not a moron i dont know thats why i ask i just wana be safe, so how can you stop virus and stuff? Or so virus not excist