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Updated: Aug 5, 2026

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Aseptic Laboratory Techniques: Plating Methods
Published on: May 11, 2012
Evaluation of primary plating media for the isolation of group A streptococcus from delayed throat cultures
Abstract:
Sulfamethoxazole-trimethoprim blood agar (SXT-BA), neomycin blood agar (NEO-BA) and plain sheep blood agar plates (SBA) were compared for isolating group A streptococci in 1,954 throat cultures. SBA and SXT-BA had similar isolation rates (approximately 75% of all positive isolates). NEO-BA was significantly better (87% recovery). A combination of any two media gave 92-95% recovery of group A streptococci from throat specimens.

