Bacitracin Susceptibility Test Discs are supplied by Micromaster. They are available in the form of filter paper discs of 6 mm diameter bearing letters "B" in continuous printing style. It is advisable to store these plates between 2-8C for maximum efficiency.

Quantity provided: 50 discs/vial

Bacitracin Susceptibility Test Discs are used for the identification and differentiation of Group A streptococci (especially S.pyogenes) from other beta-haemolytic Streptococci. Bacitracin susceptibility test discs are filter paper discs impregnated with 0.04 units of Bacitracin. Bacitracin discs can save considerable time, labour and materials if used as a screening test before serological grouping. Maxted showed that Group A streptococci were more sensitive to Bacitracin than beta-haemolytic strains of other groups. He suggested that Bacitracin might be used as a rapid diagnostic agent for Group A streptococci. Levinson and Frank who employed Bacitracin impregnated filter paper discs for this purpose, observed that many sensitive beta-haemolytic streptococci were of Group A. Steamer et al compared Bacitracin disc, fluorescent antibody technique and Lancefield precipitin technique and found that the Bacitracin disc technique was most convenient for routine clinical laboratory. Bacitracin sensitivity test along with Furacin and Optochin tests are useful for distinguishing Aerococcus viridans and S. milleri from enterococci and Streptococcus mitis.