Volume 9, Number 7—July 2003
Research
Antimicrobial Susceptibility Breakpoints and First-Step parC Mutations in Streptococcus pneumoniae: Redefining Fluoroquinolone Resistance
Sue Lim*†, Darrin Bast*†, Allison McGeer*†, Joyce de Azavedo*†, and Donald E. Low*†
Table 2
Number of isolates with ParC and GyrA amino acid substitutions and their corresponding levofloxacin MICs
| MIC (μg/mL) | No. strains with amino acid substitutions in | |
|---|---|---|
| ParC (%) | ParC and GyrA (%) | |
| 2 | 48/82 (59) | 0/29a (0) |
| 4 | 5/8 (63) | 3/8 (38) |
| 8 | 0/10 (0) | 10/10 (100) |
| ≥16 | 0/15 (0) | 15/15 (100) |
a29/82 isolates were randomly examined for GyrA mutations.
