Table 7.

Intralaboratory percent agreement by interpretive category of Etest results for seven antimicrobial agents againstM. abscessus, M. chelonae, and the M. fortuitum group

Drug% Agreementa for isolate:
M. abscessusM. chelonaeM. fortuitum group
1801180218071814183118661351135213531359
Amikacin66.7–10055.6–10010077.8–10077.8–10055.6–100100100100100
Cefoxitin10077.8–10066.7–10010010010066.7–100100100100
Ciprofloxacin10010066.7–10010066.7–10010010066.7–100100100
Clarithromycin66.7–10010066.7–10010077.8–10010010077.8–100100100
Doxycycline100100100100100100100100100100
Imipenem88.9–10010010010010010055.6–10077.8–10066.7–10066.7–100
Trimethoprim-sulfamethoxazole100100100100100100100100100100
  • a Numbers represent the range of percent agreement by interpretive category at the four participating laboratories, from the site with the most variability to that with the least variability.