Antimicrobial resistance and serotype distribution of nasopharyngeal pneumococcal isolates from healthy toddlers of Evros, Greece
Abstract
Background: Streptococcus pneumoniae (SP) strains carried in the nasopharynx of healthy children reflect the circulating strains implicated in respiratory and invasive infections.Methods: We prospectively analysed the serotype distribution of SP nasopharyngeal isolates in healthy toddlers aged 21 to 78 months (median age 63 months) attending day care centres during the winters of 2010, 2011 and 2012, with the goal of predicting the future coverage of the recently licensed 13-valent pneumococcal conjugate vaccine (PCV13) in this population. Serotyping was performed by the Quellung reaction using the 12 pooled antisera Pneumotest panel and specific factor sera. We also studied the in vitro antimicrobial susceptibilities of the isolated pneumococci to several antibiotics by E-test, and for macrolide-resistant isolates of 2010 only, the resistance genes mef(A) and erm(B).Results: Among the 543 toddlers studied, 98.8% had received ≥1 dose of 7-valent pneumococcal conjugate vaccine (PCV7), w ...
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