Hi sandy like everything with pigeons it's all about seeing a problem quickly and acting on it . It is always the secondary problems that cause the heart ache. I think it was about two years ago a friend of mine told me about this new canker treatment he had bought. ( clear capsule and herbal ingredients and cleared the pigeons in a few hours ) when I tested his pigeons they were heavily infected with canker. Gave him a tud of what I use seven day's later problem solved. I'm not saying the new treatment wouldn't work maybe his pigeons count was so high who knows.