Table 1.
MLVA type distribution of 152 M. pneumoniae clinical isolates
| MLVA typea | No. of isolates: |
Distribution by yr (no. of resistant strains) |
|||||
|---|---|---|---|---|---|---|---|
| Macrolide susceptibleb | Macrolide resistantc | 2005 | 2006 | 2007 | 2008 | 2009 | |
| 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 0 | 14 | 0 | 0 | 0 | 3 | 11 |
| 3 | 3 | 17 | 0 | 2 | 6 | 0 | 9 |
| 4 | 1 | 3 | 3 | 0 | 0 | 0 | 0 |
| 5 | 0 | 13 | 0 | 1 | 1 | 8 | 3 |
| 6 | 0 | 4 | 0 | 0 | 1 | 1 | 2 |
| 7 | 4 | 1 | 0 | 0 | 0 | 0 | 1 |
| 8 | 1 | 17 | 0 | 3 | 3 | 2 | 9 |
| 9 | 1 | 13 | 0 | 2 | 3 | 5 | 3 |
| 10 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 11 | 1 | 20 | 0 | 3 | 5 | 8 | 4 |
| 12 | 1 | 11 | 0 | 1 | 2 | 5 | 3 |
| 13 | 0 | 10 | 0 | 0 | 2 | 4 | 4 |
| 14 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 15 | 0 | 5 | 0 | 1 | 1 | 2 | 1 |
| 16 | 0 | 2 | 0 | 0 | 0 | 1 | 1 |
| 17 | 0 | 6 | 0 | 0 | 0 | 3 | 3 |
| Total | 15 | 137 | 3 | 13 | 24 | 43 | 54 |
a
The MLVA types of two reference strains were not included in this table. M. pneumoniae reference strain M129 belonged to MLVA type 13, and M. pneumoniae reference strain FH alone showed a separate MLVA type.
b
Susceptible, erythromycin MIC of ≤0.5μg/ml.
c
Resistant, erythromycin MIC of ≥1μg/ml. All erythromycin-resistant strains had a MIC of ≥64μg/ml in the present study.