Long-term effect of 10-valent pneumococcal conjugate vaccine on nasopharyngeal carriage of Streptococcus pneumoniae in children in Brazil
Nenhuma Miniatura disponível
Data
2019
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
program (NIP) in March 2010. In 2017, we investigated the effects of PCV10 on nasopharyngeal carriage
of vaccine-types (VT) and non-vaccine-types (NVT) of Streptococcus pneumoniae (Spn) among children liv ing in São Paulo city. We also compared the prevalence of VT and NVT with previous carriage surveys per formed in 2010 (baseline) and 2013.
Method: The carriage survey was conducted among 531 children, aged 12 months to <24 months,
recruited from public Primary Health Units during the immunization campaign, using previous surveys
methodology, except for qPCR, which was performed in the 2017 survey only.
Results: No statistical difference was found in the prevalence of Spn either by culture (59.7%) or by qPCR
(61.2%). Spn carriage increased from 40.3% (baseline) to 59.7% (2017 survey) (p < 0.001). Colonization by
VT isolates significantly decreased by 90.9% (19.8–1.8%) and 95.5% (19.8–0.9%) in the 2013 and 2017
surveys, respectively, compared to that at baseline. NVT isolates increased significantly by 128%
(19.6–44.8%) and 185% (19.6–55.9%) in the respective post-PCV10 surveys, most led to high prevalence
of serotypes 6C (27%), 15B (9.8%), 19A (9.2%), 15A (6.0%), and 16F (5.7%). In 2017, reduction in serotype
6A (4.2–0.6%, p < 0.001) and increase in serotype 19A (1.8–6.0%, p = 0.001) were found; serotype 3 isolate
was not detected in the present survey. We identified the emergence of 19A isolates CC320, associated
with high penicillin (MIC 2.0 mg/L) and cefotaxime (MIC 1.0 mg/L) values.
Conclusion: After 7 years of PCV10 introduction in the NIP, colonization by VT among toddlers decreased
substantially to a residual level, along with substantial serotype replacement by novel serotypes not
present in any current conjugated pneumococcal vaccine and serotype 19A. The present findings can
assist policy decisions in Brazil.
Descrição
Palavras-chave
Streptococcus pneumoniae, Nasopharyngeal carriage, Ten-valent pneumococcal conjugate vaccine, Children
Citação
BRANDILEONE, Maria-Cristina de C. et al. Long-term effect of 10-valent pneumococcal conjugate vaccine on nasopharyngeal carriage of Streptococcus pneumoniae in children in Brazil. Vaccine, Amsterdam, v. 37, n. 36, p. 5357-5363, 2019. DOI: 10.1016/j.vaccine.2019.07.043. Disponível em: https://www.sciencedirect.com/science/article/pii/S0264410X1930934X?via%3Dihub. Acesso em: 12 ago. 2024.