Table 2 Penicillin susceptibility in serogroup 6 S. 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 |