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Table 2 Penicillin susceptibility in serogroup 6S. pneumoniae by CCs/STs

From: Population biology of 225 serogroup 6 Streptococcus pneumoniae isolates collected in China

CCs/STs No. isolates Oral penicillin breakpoints MIC50 (μg/mL) MIC90 (μg/mL) MIC range (μg/mL)
I R
ST982 52 0 0 0.032 0.049 0.001–0.064
CC90 41 36(87.8%) 5(12.2%) 1 1.5 0.25–2
CC4542 25 0 0 0.016 0.023 0.003–0.032
ST2912 11 0 0 0.032 0.049 0.016–0.049
CC4536 15 0 0 0.016 0.032 0.016–0.064
CC2754 11 0 0 0.023 0.032 0.008–0.064
CC8616 10 0 0 0.016 0.023 0.002–0.023
CC386 10 4(40.0%) 0 0.064 0.125 0.032–0.125
Others 46 22(47.8%) 4(8.7%) 0.19 0.75 0.008–2
Total 225 63(28.0%) 9(4%) 0.032 1 0.001–2