SORD and infection: Interestingly, [24] also tested SCID foals to determine whether the immune system could be involved in tissue damage: those foals resulted in lower viremia levels compared to immunocompetent animals and also liver enzymes could hardly be comparable with those of adult horses (even though the authors also question the reliability of detected GGT and SDH levels in foals, since it has been reported that within the first year of life those enzymes are susceptible to physiological variations), providing potential evidence of the role of T-cell-mediated immunopathology in EqHV infections.