Two years ago, I had a very tough to kill strain of ringworm hit my bull pen. I have no idea where it came from but it was the toughest to get rid of I have ever had. It seemed to have the toughest and thickest crust of any ringworm I have ever experienced before. On some bulls it was all over their bodies and it appeared like it would be extremely sore for the bulls. I treated them with every remedy I have ever used before and it would partially work but in a few days it would be back as bad as ever before. I think I treated many of the bulls at least 15 times and was starting to think I would have to pull some out of our bull sale. Finally, after giving up on every other option I could find, I purchased a few tubes of Atheletes Foot cream in a local pharmacy. I was a fairly expensive fix, but it had the ringworm killed after two days and hair growing in less than a week. Up until that year, I had found Fluid Film worked well, as well as Sullivan's Fungus Fighter. In the past I have also found that Crest toothpaste worked very well. I have also used a home remedy that my grandfather made up and it has worked very well also... These all worked until 2 years ago.
I was thinking that I would probably would have incredible ringworm issues every year as I use the same pen for the bulls each year. Last year I only had a couple animals with ringworm and they were cleaned up quickly. This year, I have treated 4 bulls with ringworm and they have also cleared up quickly. Everything else has remained the same.. same pen, same feed, same management etc. I am not sure why ringworm can be epidemic one year and not much of an issue the next.