Howie-just realized I somehow missed your question before I posted a minute ago - but I am not aware of any shampoo for tinea for people or for cats. This must be something new. I would be reluctant to use a shampoo on a cat for tinea unless it was highly recommended by my vet, though, because it would have to be used every day for what may be weeks, and cats should not be bathed that often - in fact, not at all unless they get into something or have matting long hair, or some other such condition that can endanger their health. So, to answer your question, no, I have not had any experience with a shampoo for ringworm.