Reevaluation of Clinical and Laboratory Standards Institute disk diffusion breakpoints for tetracyclines for testing Enterobacteriaceae.
We reevaluated Enterobacteriaceae disk diffusion breakpoints for the tetracyclines published in the Clinical and Laboratory Standards Institute (CLSI) document M100-S16, which were (susceptible/resistant) >or=19 mm/<or=14 mm for tetracycline, >or=16 mm/<or=12 mm for doxycycline, and >or=19 mm/<or=14 mm for minocycline. A collection of 504 recent clinical isolates of Enterobacteriaceae were tested against these tetracycline compounds by disk diffusion and broth microdilution methods according to CLSI guidelines. Regression line and scattergram plot analyses determined intermethod accuracy for current disk diffusion breakpoints and showed excellent r values of 0.91 to 0.95. However, error rates (minor/major [false-resistant]/very major [false-susceptible]) were 14.9/0.8/0.0% for tetracycline, 11.5/0.4/0.0% for doxycycline, and 30.6/0.7/0.0% for minocycline and only 4.4/0.0/0.0% for tetracycline, 5.6/0.0/0.2% for doxycycline, and 8.3/0.0/0.3% for minocycline when proposed breakpoints were modified to (susceptible/resistant) >or=15 mm/<or=11 mm for tetracycline, >or=14 mm/<or=10 mm for doxycycline, and >or=16 mm/<or=12 mm for minocycline. Listed modifications were recently approved by the CLSI (M100-S17).
Sader
Helio S
HS
JMI Laboratories, 345 Beaver Kreek Centre, Suite A, North Liberty, Iowa 52317, USA. helio-sader@jmilabs.com
Ferraro
Mary J
MJ
Reller
L Barth
LB
Schreckenberger
Paul C
PC
Swenson
Jana M
JM
Jones
Ronald N
RN
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D052978:Disk Diffusion Antimicrobial Tests / Q000592:standards*; D024881:Drug Resistance, Bacterial; D004755:Enterobacteriaceae / Q000187:drug effects*; D007753:Laboratories / Q000592:standards; D013754:Tetracyclines / Q000494:pharmacology*
D000900:Anti-Bacterial Agents; D013754:Tetracyclines