I posted a thread a few months ago when my new cat brought ringworm into my home. It was a nightmare and still is. Over $2000 and following the vets instructions to the tee and after 2 negative fungal cultures on all cats, the original cat to bring ringworm into the house has broken out again. The meds were finished 3 weeks. I have heard of a product called Health Guard Laundry additive that claims to kill the M-canis fungus and leave a residual for 2 weeks on surfaces treated, and (A-33 dry) for washing floors, counters, walls etc. Has anyone used these products or heard anything about them.