Table 2.
Susceptibility of 2007 pneumococcal isolates to various antibiotics.
| No. of pneumococcal isolates |
|||||||
|---|---|---|---|---|---|---|---|
| Serotype 6A |
Serotype 6C |
||||||
| Antibiotic | S | I | R | S | I | R | Pa |
| Amoxicillin | 2 | 3 | 7 | 25 | 8 | 3 | .002 |
| Penicillin G | 0 | 9 | 3 | 28 | 0 | 8 | < .001 |
| Ceftriaxone | 10 | 2 | 0 | 36 | 0 | 0 | .059 |
| Clindamycin | 12 | 0 | 0 | 35 | 1 | 0 | < .99 |
| Erythromycin | 7 | 0 | 5 | 30 | 0 | 6 | .12 |
| Levofloxacin | 10 | 2 | 0 | 33 | 2 | 1 | .59 |
| Rifampin | 12 | 0 | 0 | 35 | 1 | 0 | < .99 |
| Trimethoprim-sulfamethoxazole | 8 | 0 | 4 | 28 | 5 | 3 | .47 |
NOTE. Cutoff values (mg/L) were as follows for sensitivity and resistance, respectively: amoxicillin, ≥ 0.5 and ≤ 2; penicillin, ≥ 0.06 and ≤2.0; ceftriaxone, ≥0.5 and ≤2.0; clindamycin, ≥0.5 and ≤4; erythromycin, ≥0.25 and ≤1; levofloxacin, ≥2 and ≤8; rifampin, ≥1 and ≤4; and trimethoprim-sulfamethoxazole, ≥0.5 and ≤4. I, intermediately resistant; R, resistant; S, susceptible.
a
Fisher’s exact test was used to compare the fractions of 6A and 6C isolates that were susceptible to each antibiotic.