EquineCare Probiotic is a simple and safe spray on probiotic treatment for bacterial and fungal diseases such as mud fever and rain scald. Mud fever or rain scald is caused by a bacteria which is always present in horses. The bacteria proliferates under the right conditions, which are generally warm and wet. Often this bacteria causes open sores which are painful to the horse.BioMed works by introducing beneficial micro-organisms which compete with and ultimately overcome the pathogenic bacteria which cause the disease. BioMed is made from a naturally brewed combination of beneficial bacteria and fungi. There are no chemical additives or plant derived biocides contained in the product. BioMed is a pro-biotic product rather than a biocide.