Abstract
The Meropenem Yearly Susceptibility Test Information Collection (MYSTIC) Programme was initiated in 1997 (1999 for the United States). This program monitors resistance in participant medical centers where carbapenems are prescribed and drug use data can be obtained. An earlier report found antimicrobial use was not a clear cause of local or aggregate changes in resistance rates. This study addresses the role of dissemination of resistant clones on susceptibility rates for nonfermentors, Acinetobacter spp. (ACB) and Pseudomonas aeruginosa (PSA). Carbapenem (CARB)-multidrug-resistant strains (MDR) from among 236 ACB and 1,111 PSA were tested by reference broth microdilution methods, automated ribotyping, and pulsed field gel electrophoresis to determine possible clonal dissemination. Each strain was also tested for metallo-beta-lactamases (MbetaL) (phenotypic and polymerase chain reaction); and then analyzed by CARB-R rate and defined daily dose (DDD)/100 days use groupings (high, moderate, and low). For the aggregate 15 sites in the MYSTIC Programme each year, the CARB-resistant rate decreased over 5 years; but other drug-resistance rates generally escalated. Changes were not related to antimicrobial use calculations. The discov...Continue Reading
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