Antimicrobic Vial P BD Difco™ 6 x 10 ml. Contains polymyxin B. For enumerating Bacillus cereus from foods use with:MYP Agar (Cat. No. 281010) and Egg Yolk Enrichment 50% (Cat. Nos. 233471 and 233472)Also for use with: SFP Agar Base (Cat. No. 281110).