Severe symptoms of EPM (Equine Protozoal Myelitis) may include:

Severe symptoms of Equine Protozoal Myelitis (EPM) can indeed include the falling and collapsing of the hindquarters. This occurs because EPM is a neurological disease caused by the protozoan parasite Sarcocystis neurona, which affects the horse's central nervous system. The parasite can damage the nerves that control movement, resulting in a lack of coordination and strength, particularly in the hind legs. Horses may exhibit weakness, difficulty standing, or in severe cases, can lose their balance and fall, reflecting the severity of their neurological condition.

While excessive sweating, changes in heart rate, and coat color changes can be associated with various equine health issues, they are not specific indicators of EPM. Understanding that the primary concern with EPM manifests as neurological deficits helps to discern the severity of symptoms and appropriate responses in affected horses.