The HiMedia Bacitracin B Discs (REF DD015‑1VL) come as a single vial containing 50 ready-to-use discs. Designed specifically for bacteriological differentiation, these discs are impregnated with 0.04 units of bacitracin, enabling rapid and reliable identification of Group A β‑hemolytic streptococci, particularly Streptococcus pyogenes, from other β‑hemolytic streptococci