with regard to an immune response , freund complete adjuvant induced strong delayed hypersensitivity to purified protein derivative ( ppd ) and peptidoglycan ( pg ) in all rat strains used , whereas the squalane-type adjuvant induced these hypersensitivities only in lewis and buffalo rats , but not in fisher and brown norway rats .
C0034131
purified protein derivative
C0020517
hypersensitivities