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Home The Basics Symptoms Diagnosis Treatments Living With an AE Resources for Caregivers Physicians Research Informational Videos About Us NEWS EVENTS Shop More Hashimoto39s EncephalopathySREAT Seronegative Autoimmune Encephalitis Alliance Providing patient support public awareness and medical research for Hashimoto39s Encephalopathy HESREAT and Seronegative Autoimmune Encephalitis SAE. HESA is a 501 3c not for profit organization for Autoimmune EncephalitisspecificallyHashimoto39s EncephalopathySREAT HESREAT and Seronegative Autoimmune Encephalitis SAE. Seronegative means there is no known antibody identified as the cause of Autoimmune Encephalitis. The Hashimotos EncephalopathySREAT Seronegative Autoimmune Encephalitis Alliance was formed in 2012 by two HE patients.