Thank you mitts & tess for all of your very helpful advice. I have already started applying the athlete's foot cream, but was only doing it once per day. I will up it to twice. I will also look for the shampoo & conditioner you mentioned. One thing I am unclear about is whether the cats should be kept in isolation while attempting to "sanitize" the rest of the house. The previous vet who attempted to help us deal with this issue (who also told me that euthanizing them was a very valid option!) had us keep the cats in isolation for 3 months during daily treatment of internal itraconazole ($100/month). This was not an ideal setup for anyone, including the cats. I was told it was necessary to do this so the spores around our house did not re-infect the cats during their treatment. The idea that I have to fully eliminate every spore that may be floating around my home seems next to impossible. I've read that you need to sanitize hard surfaces with a 1:10 bleach solution, but what about surfaces that can't be bleached such as furniture, area rugs, carpeting? What about every little nook and cranny in the basement that the cats may have scurried into? There is just no way of feasibly cleaning every square inch of my home... I have already attempted this once and apparently I failed. So, I guess that is a two parter question... 1) do they need to be isolated and 2) do I really need to "sanitize" every inch of my home? Also, how long should I do the cream/shampoo/conditioner/colloidal silver regimen? I know you are supposed to treat it even after the hair regrows, but exactly how long is long enough?
Thank you in advance for further answering my questions. You have already been incredibly helpful. I was so disgusted with the vet who told me I should put them to sleep, I cried all day at the thought and how she made it seem impossible to get rid of this. Of course having a pet comes with costs, it's just that we do have a pretty fixed budget and another $500-600 dollars trying to clear this up with no guarantees just isn't financially smart for our family. My kids got ringworm before we started this treatment. Now I have it after spending all that money and time and effort and it's just very disheartening. But we do love the cats and want them to stick around!