SPM is an equine neurological disease which occurs seasonally in certain areas of North America and Europe, the cause of which was unknown for centuries despite the disease being well known among affected areas and was only positively determined in the 21st century.
SPM is an equine neurological disease which occurs seasonally in certain areas of North America and Europe, with symptoms including stiffness, difficulty walking or standing, dark urine and eventually breathing rapidly and become recumbent. The cause of SPM was unknown for centuries despite the disease being well known among affected areas and was only positively determined in the 21st century.