I get YBS every year and ive tried everything to prevent it with no joy. I hear a few other fanciers say they never get it well that really baffles me to say the least, infact i dont buy it. How often are you using vanodine 18 mate ?? and by the way some fanciers widna know ybs if it jumped out there soup. I was reading somewhere that the virus which causes ybs (ADENOVIRUS)is spread through droppings and saliva and is also Airborne.