Table 2.

Distribution of 9,243 pneumococcal isolates according to MICs of penicillin and cefotaxime in Spain from 1990 to 1996a

MIC cefotaxime (μg/ml):No. of strains for which the MIC of penicillin (μg/ml) is:Total no. of strains
≤0.060.120.250.51248
≤0.064,65011421220004,789
0.1252175223281000479
0.2584128223321100586
0.5644145180673001,381
1004641,049652701,776
2001037134222196
400011316728
8001000078
 Total no. of strains4,7163345737791,91786345169,243
  • a Susceptibility categorizations for penicillin and cefotaxime: highly resistant, MIC ≥ 2 μg/ml (both); moderately resistant, 0.12 μg/ml ≤ MIC ≤ 1 μg/ml and MIC = 1 μg/ml, respectively; and susceptible, MIC ≤ 0.06 μg/ml and ≤ MIC ≤ 0.5 μg/ml, respectively.