Abstract
To investigate antimicrobial resistance in viridans group streptococci (VGS) among patients with and without the diagnosis of cancer in the USA, Canada and Latin America. All bloodstream isolates of VGS collected from SENTRY centers in the Western Hemisphere between January 1997 and December 1999 were tested by reference broth microdilution methods (NCCLS). Results for isolates from patients with cancer were compared to those from other patient populations. Overall, 438 unique patient bloodstream isolates of VGS were collected during the study. Percentage susceptible/MIC90 (mg/L) values for antimicrobials tested were as follows: penicillin, 66/1; erythromycin, 60/4; clindamycin, 92/0.12; cefepime, 86/1; trimethoprim-sulfamethoxazole, 80/2; ciprofloxacin, 44/> 2; gatifloxacin, 98/0.5; and vancomycin, 100/1. Of these isolates, 70 (16%) were confirmed to be from cancer patients. VGS isolates from cancer patients were less susceptible to most antimicrobials tested than were isolates from non-cancer patients. The greatest differences in susceptibility rates for cancer- versus non-cancer-associated VGS isolates were seen for ciprofloxacin (34% versus 46%, P = 0.07) and trimethoprim-sulfamethoxazole (64% versus 83%, P < 0.001), two ag...Continue Reading
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