Yersinia Selective Agar Base (CIN Agar Base) BD Difco™ 500 g. CIN (Cefsulodin-Irgasan-Novobiocin) Agar Base, when supplemented with cefsulodin andnovobiocin (Yersinia Antimicrobic Supplement CN, Cat. No. 231961), is a differential andselective medium used in qualitative procedures for the isolation of Yersinia enterocoliticafrom a variety of clinical and non-clinical specimens.