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. 2009 Aug;15(8):1260–1264. doi: 10.3201/eid1508.081187

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Increased prevalence of erythromycin-resistant Streptococcus pneumoniae (ERSP), by age group, Prospective Resistant Organism Tracking and Epidemiology for the Ketolide Telithromycin, United States surveillance study, years 1–6 (2000–2006).