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Table 1 Susceptibility and minimum inhibitory concentrations (MICs) of 140 S. pneumoniae isolates to erythromycin and tetracycline

From: Molecular characteristics of erythromycin-resistant Streptococcus pneumoniaefrom pediatric patients younger than five years in Beijing, 2010

Age group No. Antibiotics Susceptible Intermediate Resistant MIC50 (μg/mL) MIC90 (μg/mL) MIC range (μg/mL)
0 to 2 years 57 erythromycin 3 (5.3%) 0 (0%) 54 (94.7%) >256 >256 0.125- > 256
tetracycline 9 (15.8%) 5 (8.8%) 43 (75.4%) 12 16 0.064-16
2 to 5 years 83 erythromycin 1 (1.2%) 1 (1.2%) 81 (97.6%) >256 >256 0.125- > 256
tetracycline 6 (7.3%) 9 (10.8%) 68 (81.9%) 12 16 0.094-32
0 to 5 years 140 erythromycin 4 (2.9%) 1 (0.7%) 135 (96.4%) >256 >256 0.125- > 256
   tetracycline 15 (10.7%) 14 (10.0%) 111 (79.3%) 12 16 0.064-32