TABLE 2.
Numbers of isolates yielding positive screening results as determined by the Etest macromethod and numbers of hGISA isolates detected by the vPAP and/or tPAP methods
| MRSA collection no., name, yr (no. of isolates/no. of patients)a | No. of isolates yielding positive screening results by the Etest macromethod
|
hGISAe
|
|||
|---|---|---|---|---|---|
| V and T ≥ 8 or T ≥ 12 (mg/liter)b | T = 8 (mg/liter)c | T ≥ 8 (mg/liter)d | No. of isolates (%) | No. of patients (%) | |
| 1, H1 Q4, 1998 (188/169) | 7 | 8 | 15 | 10 (5.3) | 10 (5.9) |
| 2, N/S study, 1999 (714/682) | 74 | 62 | 136 | 81 (11) | 81 (12) |
| 3, EARSS, 1999-2003 (1,580/1,507) | 15 | 31 | 46 | 39 (2.5) | 39 (2.6) |
| 4, NMRSARL, 2000-2003 (97/59) | 19 | 11 | 30 | 28* (29) | 22* (37) |
| 5, H1 Q2, 2003 (330/303) | 18 | 7 | 25 | 16 (4.9) | 16 (5.3) |
| 6, H1 Q4, 2004 (280/270) | 6 | 0 | 6 | 4 (1.4) | 4 (1.5) |
| Total (3,189/2,990) | 139 | 119 | 258 | 178 (5.6) | 172 (5.8) |
a
See Table 1, footnote a.
b
Cutoff values of ≥8 mg/liter for both vancomycin (V) and teicoplanin (T) or ≥12 mg/liter for teicoplanin alone.
c
Cutoff value of 8 mg/liter for teicoplanin (T) alone.
d
Cutoff value of ≥8 mg/liter for teicoplanin (T).
e
*, hGISA isolates comprised of 27 hGISA isolates from 22 patients and 1 isolate from an environmental source. Single isolates were recovered from 19 patients; two isolates were recovered from 1 patient, and three isolates were recovered from 2 patients.