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Summary: Ringworm is contagious so long as there are any active spores left to grow on the surface of the animal's skin. Treat ringworm using an anti-fungal medication with helpful information from a practicing veterinarian in this free video on pet care.
Dr. James Dee is a veterinarian and partner at Hollywood Animal Hospital in Hollywood, Fla. He is a graduate of Auburn University,1972,D.V.M. Special interests include veterinary...read more
"Hello my name is Dr. James Dee. I'm with Hollywood Animal Hospital in Hollywood, Florida. Ringworm is considered a dermatophyte, a fungus. It's not a worm per say. It gets the name because it leaves a lesion that looks like a circle similar to some other problems. How long is it contagious? This is a tough question because obviously it's not contagious once you have a cure. You don't know if you have a cure unless you are doing multiple cultures on the pet. Cultures normally are done by using a toothbrush through the coat and then going ahead and growing out the dander to see if there's any active spores left to grow. There are three types of dermatophyte that we are concerned with, Microsporum canis, Microsporum gypsum and trichafitumphytes. All three can be contagious to people."
eHow Article: How Long Is Ringworm Contagious?