I tend to agree with y'all that it's contagious, but I wanted to note that Dr. Sears, in The Baby Book, writes that it's less contagious than impetigo and not a reason to keep your child home from daycare...
I'm currently fighting it with my son who is about twelve weeks old and am concerned that he got it from dear husband who has had a skin fungal infection for years... I, apparently, am resistant.
Could those of you who've conquered it with tea tree oil, grapefruit seed extract or colloidial silver please post specifics--how much, how often, how did you apply it. Also do you need to disinfect sheets, clothing and other things that the ringworm has contacted? How?