title: Possible involvement of HIV in neuropsychiatric episode in patient seronegative for two (or more) years.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000150:complications* / Q000276:immunology; D000914:Antibodies, Viral / Q000032:analysis; D015483:HIV Antibodies; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000209:etiology*; D008875:Middle Aged; D009422:Nervous System Diseases / Q000209:etiology*
chemical_list: D000914:Antibodies, Viral; D015483:HIV Antibodies