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Comparative Study
Journal Article
In vitro inferiority of ceftazidime compared with other beta-lactams for viridans group Streptococcus bacteremia in pediatric oncology patients: implications for antibiotic choices.
Journal of Pediatric Hematology/oncology 2009 April
Viridans group Streptococcus (VGS) is a leading cause of bacteremia in pediatric oncology patients, primarily in children with acute myeloid leukemia or after hematopoietic stem cell transplantation. We retrospectively identified all positive blood cultures in oncology patients at the British Columbia Children's Hospital for a period of 54 months. VGS was the second most commonly isolated pathogen, present in 19% of all the positive blood cultures. Susceptibility analysis of 46 VGS isolates from that period was performed using the Etest method for penicillin, cefotaxime, ceftazidime, and piperacillin/tazobactam. The geometric mean minimal inhibitory concentration for ceftazidime was found to be 9 to 12-fold higher than for any other beta-lactam antibiotic. Penicillin resistance was of 13% with an additional 20% of samples with intermediate susceptibility. The study underscores the prevalence of VGS bacteremia in pediatric patients, especially with acute myeloid leukemia or postallogeneic hematopoietic stem cell transplantation, and the in vitro inferiority of ceftazidime compared with other beta-lactams in that context. We conclude that monotherapy with ceftazidime, or its use along with an aminoglycoside, is not an optimal therapy in pediatric oncology patients with febrile neutropenia.
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