title: Letter: Antigens in hospitals.
mesh_terms: D000917:Antibody Formation; D000941:Antigens; D002188:Cannabis; D006801:Humans; D007104:Immune Adherence Reaction; D010564:Personnel, Hospital; D019966:Substance-Related Disorders / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000941:Antigens