TABLE 1.
Yr and species | No. of isolates | LZDb MIC50 (mg/liter) | LZD MIC90 (mg/liter) | No. optrA positive | Percentage (%) |
---|---|---|---|---|---|
2004-2005 | |||||
E. faecalis | 125 | NDc | ND | 0 | 0 |
E. faecium | 115 | ND | ND | 1 | 0.9 |
Other Enterococcus spp. | 22 | ND | ND | 0 | 0 |
Overall | 262 | 1 | 0.4 | ||
2007-2008 | |||||
E. faecalis | 158 | ND | ND | 1 | 0.6 |
E. faecium | 149 | ND | ND | 0 | 0 |
Other Enterococcus spp. | 39 | ND | ND | 0 | 0 |
Overall | 346 | 1 | 0.3 | ||
2009-2010 | |||||
E. faecalis | 113 | 2 | 2 | 6 | 5.3 |
E. faecium | 195 | 1 | 2 | 1 | 0.5 |
Other Enterococcus spp. | 36 | 1 | 2 | 0 | 0 |
Overall | 344 | 7 | 2.0 | ||
2011-2012 | |||||
E. faecalis | 276 | 1 | 2 | 8 | 2.9 |
E. faecium | 304 | 1 | 2 | 1 | 0.3 |
Other Enterococcus spp. | 1 | —d | — | 1 | 100 |
Overall | 581 | 10 | 1.7 | ||
2013-2014 | |||||
E. faecalis | 315 | 2 | 2 | 22 | 7.0 |
E. faecium | 352 | 2 | 2 | 3 | 0.9 |
Other Enterococcus spp. | 1 | — | — | 1 | 100 |
Overall | 668 | 26 | 3.9 | ||
2004-2014 | |||||
E. faecalis | 987 | 2e | 2e | 37 | 3.7 |
E. faecium | 1,115 | 1e | 2e | 6 | 0.5 |
Other Enterococcus spp. | 99 | 1e | 2e | 2 | 2.0 |
Overall | 2,201 | 45 | 2.0 |
The Center Net of Mohnarin program and CARST program collected the isolates from the middle of one year to the middle of the following year.
LZD, linezolid.
ND, not detected.
—, linezolid MIC50 and MIC90 were not calculated.
MIC50 and MIC90 were calculated according to the MICs of isolates screened from 2009 to 2014.