A presumptive diagnosis of secondary ethylene glycol toxicity in a female Turkey vulture (Cathartes aura) was madedepending on the histopathological changes found in the renal tubules and presence of Isospora spp. of non-avian typewithin the colon. To the best of our knowledge, this is the first reported case of possible secondary ethylene glycol toxicityin a Turkey vulture in Louisiana State/USA.