Genimal has developped the new IMM test for the Quarter horse breed. The IMM causes a rapid atrophy of muscles. The horses can lost 40% of the muscle mass. The horses that are affected homozygous (IMM/IMM) are more susceptible to have autoimmune episodes and recurring autoimmune incidences in comparison to the heterozygous horses. Corticosteroids are primarily used and can be effective 72 hours after administration.