title: Introductory immunology-1: What is immunity?
mesh_terms: D000293:Adolescent; D000328:Adult; D002675:Child, Preschool; D006801:Humans; D006967:Hypersensitivity / Q000276:immunology; D007109:Immunity; D007110:Immunity, Active; D007112:Immunity, Maternally-Acquired; D008297:Male; D014376:Tuberculosis / Q000276:immunology