Product Code TBL 046
Description
Bacitracin Disks are used in the presumptive identification of group A ?-hemolytic streptococci and allow for
differentiation of group A ? -hemolytic streptococci from other ? -hemolytic streptococci. Group A streptococci have
been shown to be more sensitive to bacitracin than beta-haemolytic stains of other groups allowing bacitracin to be
used as a rapid diagnostic agent for presumptive identification of Group A streptococci. S. pyogenes is a betahaemolytic
species of Gram positive bacteria that is responsible for a wide range of both invasive and non-invasive
infections. S. pyogenes is the most common bacterial cause of acute pharyngitis, accounting for 15-30% of cases in
children and 5-10% of cases in adults. Bacitracin discs can save considerable time, labour and materials if used as a
screening test before serological grouping. 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.
Principle
For identification of Streptococcus pyogenes.
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