When we adopted Jazz from the shelter she came in with ringworm (we didn't find out until she was already home). Because she also had a severe URI we had to keep her quarantined in the guest room for 5 weeks until the URI and ringworm had cleared. The vet gave me an ointment to put on her spots twice a day and some kind of liquid med for the ringworm to give her which I found out later from my regular vet that she shouldn't have been on because she was too young. Thank goodness it didn't harm her and for the life of me I can't remember the name of it but I had to get it from a compounding pharmacy in another town and have it mailed to me.

I spent most the time caring for her and never caught it and neither did my dog or other cat but Richard got a suspicious place on his forehead. He freaked out and jumped in the swimming pool and held a chlorine tablet to it for several minutes and the spot dried up and went away the next day. I'm not recommending it as a treatment but...

I think the main reason I didn't get it was because I used Clorox wipes to wipe down everything in the room with her every time I went in - especially the door knob. I washed my hands immediately upon leaving the room with antibacteria soap. I was extremely careful and it paid off.

Good luck. Ringworm is no fun to deal with and you have my sympathies.