Antimicrobic Vial A BD Difco™ 6 x 10 ml. Antimicrobic Vial A, containing chlortetracycline, is used in preparing selective microbiologicalculture media. Chlortetracycline selectively inhibits bacterial growth by inhibiting protein synthesisand restricts the size and height of colonies of more rapidly growing molds. Contains25 mg desiccated chlortetracycline per 10 ml vial. The resulting concentration of the rehydratedsolution is 2.5 mg chlortetracycline per ml. Can be used with BD Difco™ Cooke Rose Bengal Agar (Cat. No. 270310).