I have a biter - shouting doesn't work, he just laughs at me.
Actually, it seems to coincide with teething, now that he has all his teeth (he is 19 months) it seems to have trailed off (I hope!) but it started nearly a year ago at around 8 months. Mostly it has been me that has been bitten, fortunately.
Now, if he bites, he gets set down, and told firmly, no biting, and has to hug to say sorry. My feeling is that when he does it now, it is because he is tired or frustrated or can't express himself (he seems to be slow with talking, so we are working on that).
At nursery, they keep a close eye on him - so far he has been bitten twice by others, so I am a) glad that he is not the one who has bitten and b) reassured that it is not just him.
I have also used re-direction, giving him something I am happy for him to bite, like a plastic spoon, but as I think he bites when tired, I think listening to the message behind the biting is equally important. I have also asked the nursery to keep track of what precipitates the behaviour to see if there is a pattern.
Don't believe in biting back. They can't help it.