PLEASE read our ringworm care link! It will tell you everything you need to know about hygiene measures and treatment.
I've managed to keep a ringworm outbreak confined to just one piggy in a room of thirty, and he was with his companion in the same quarantine cage throughout the whole treatment - his sow-wife just had some days on the oral anti-fungal as well as well as the bath at the end and never developed it. That was four years ago and I haven't had any new ringworm since. It wasn't fun deep cleaning the whole room and all piggy pens but it did the trick and everything was sorted within a week and two weeks extra for abservation afterwards before my pair was allowed to return into the piggy room. Our advice
really works!
Here is the link to it again:
Ringworm: Hygiene, Care And Pictures