Volume 10, Number 9—September 2004
Letter
Vancomycin Heteroresistance in Methicillin-resistant Staphylococcus aureus, Taiwan
Table
Characteristics of 21 methicillin-resistant Staphylococcus aureus isolates recovered from two patients with recurrent bacteremiaa
Designation of isolate | Date of isolation (mo/day/year) | Vancomycin MIC (μg/mL) |
Teicoplanin MIC (μg/mL) |
||||
---|---|---|---|---|---|---|---|
Etest |
Broth microdilution |
Agar dilution |
Agar dilution |
||||
BHI | BHI | MHB | BHI | MHA | MHA | ||
Patient A (89-y-old man) | |||||||
A1 | 6/30/2000 | 3 | 2 | 1 | 2 | 2 | 2 |
A2 | 6/14/2001 | 4 | 3 | 1 | 2 | 2 | 2 |
A3 | 11/19/2001 | 4 | 4 | 2 | 2 | 2 | 2 |
A4 | 3/5/2002 | 4 | 3 | 1 | 2 | 2 | 4 |
A5 | 3/22/2002 | 4 | 3 | 2 | 3 | 2 | 4 |
A6 | 4/3/2002 | 6 | 5 | 4 | 4 | 2 | 4 |
A7 | 4/14/2002 | 6 | 5 | 4 | 4 | 3 | 4 |
A8 | 4/29/2002 | 5 | 4 | 2 | 4 | 3 | 8 |
A9 | 4/29/2002 | 6 | 3 | 2 | 4 | 3 | 4 |
A10 | 5/7/2002 | 6 | 4 | 2 | 4 | 2 | 4 |
Patient B (72-y-old man) | |||||||
B1 | 4/26/2000 | 3 | 2 | 1 | 2 | 1 | 2 |
B2 | 5/6/2000 | 4 | 2 | 1 | 2 | 2 | 8 |
B3 | 5/18/2000 | 6 | 4 | 2 | 4 | 3 | 8 |
B4 | 5/29/2000 | 5 | 4 | 1 | 4 | 2 | 8 |
B5 | 6/15/2000 | 6 | 3 | 2 | 4 | 3 | 8 |
B6 | 6/24/2000 | 8 | 4 | 2 | 4 | 3 | 8 |
B7 | 7/19/2000 | 8 | 4 | 3 | 5 | 3 | 8 |
B8 | 1/9/2001 | 4 | 1 | 1 | 2 | 1 | 1 |
B9 | 1/26/2001 | 4 | 2 | 1 | 2 | 1 | 1 |
B10 | 3/21/2001 | 3 | 2 | 1 | 2 | 1 | 1 |
B11 | 4/6/2001 | 4 | 2 | 1 | 2 | 1 | 1 |
Mu3 | 3 | 3 | 2 | 3 | 2 | – | |
Mu50 | 10 | 8 | 5 | 8 | 4 | – |
aBHI, brain heart infusion; MHB, Mueller-Hinton broth; MHA, Mueller-Hinton agar.