Carriage and invasive isolates of <Emphasis Type="Italic">Streptococcus pneumoniae</Emphasis> in Caracas,Venezuela: the relative invasiveness of serotypes and vaccine coverage |
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Authors: | I A Rivera-Olivero B del Nogal M C Sisco D Bogaert P W M Hermans J H de Waard |
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Institution: | 1.Laboratorio de Tuberculosis,Instituto de Biomedicina,Caracas,Venezuela;2.Departamento de Pediatría,Hospital de Ni?os “J.M. de Los Rios”,Caracas,Venezuela;3.Department of Pediatric Immunology,UMC Utrecht-WKZ,Utrecht,The Netherlands;4.Laboratory of Pediatric Infectious Diseases,Radboud University Nijmegen Medical Centre,Nijmegen,The Netherlands;5.Instituto de Biomedicina,Universidad Central de Venezuela,Caracas,Venezuela |
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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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