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Carriage and invasive isolates of Streptococcus pneumoniae in Caracas, Venezuela: the relative invasiveness of serotypes and vaccine coverage

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Abstract

The introduction of a pneumococcal conjugate vaccine in Venezuela needs previous studies to assess vaccine efficiency. We conducted a survey of nasopharyngeal pneumococcal carriage in urban children in Caracas and studied the distribution of serotypes. We compared these data with survey data available for invasive strains isolated in the same area and in the same time period. An overall pneumococcal carriage rate of 27% was observed. The most predominant capsular serotypes among carriage isolates were 6B (29%), 19A (13.8%), 23F (10%), 14 (8.3%), 6A (8.3%) and 15B/C (3.3%) and among invasive isolates 6B (25%), 14 (15%), and 19A, 6A, 7F, and 18 (7.5% each). The serotypes/groups 1, 5, 7F and 18, jointly covering 30% of the invasive strains, represented less than 0.7% of the carrier strains. The theoretical coverage of the pneumococcal conjugate vaccine PCV13 for carriage and invasive strains was calculated to be 74% and 90%, respectively. Our study demonstrates important differences for the serotype distribution in disease and carriage isolates and provides a key baseline for future studies addressing the prevalence and replacement of invasive and carriage serotypes after the introduction of the PCV 13 vaccine in Venezuela in the year 2010.

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Acknowledgements

This study was financially supported by research grants 0887X1-8802 from Wyeth Venezuela CA. We are grateful to the pediatric department “Niños Sanos” of the Children Hospital JM de los Rios, Caracas, Venezuela, especially Dr. Anabela Fernandez and Dr. Yecenia Pérez, and also of the Tuberculosis Laboratory Xiomara Brito and Domingo Ramos for technical assistance. Both Ismar Rivera-Olivero and Berenice del Nogal are considered first authors.

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Correspondence to J. H. de Waard.

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Rivera-Olivero, I.A., del Nogal, B., Sisco, M.C. et al. Carriage and invasive isolates of Streptococcus pneumoniae in Caracas, Venezuela: the relative invasiveness of serotypes and vaccine coverage. Eur J Clin Microbiol Infect Dis 30, 1489–1495 (2011). https://doi.org/10.1007/s10096-011-1247-5

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