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(A) Combined trimethoprim-sulfamethoxazole MICs and disk zone diameters recorded with the 50-strain collection by the four laboratories. Trimethoprim-sulfamethoxazole disks are abbreviated as SXT on these graphs. (B) Trimethoprim-sulfamethoxazole MICs and disk zone diameters recorded with 100 unique meningococcal isolates contributed individually by the four laboratories. The vertical lines represent the proposed zone diameter breakpoints.
