2008, Number 3
Enf Infec Microbiol 2008; 28 (3)
Prevalence of Streptotococcus pneumoniae in nasopharyngeal isolates from children attending in care-day centers of Petroleos Mexicanos
Limón RAE, Reyna FJ, Maldonado RC, Wakida KG, Espinosa LE, Gómez BD, Ayala MO
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ABSTRACTObjective. To determine the prevalence of Streptococcus pneumoniae serotypes in nasopharyngeal isolates from children attending four day-care centers of Petróleos Mexicanos in Mexico City.
Material and Methods. A cross-sectional survey was conducted in children of two months to five years old. A nasopharyngeal sample was taken. S. pneumoniae identification, and capsular serotyping were performed.
The types of S. pneumoniae were identified by means of serums produced by Statens Serum Institut (SSI), Denmark. Ethical considerations in this study were authorized by the committee of research and ethics.
Results. S. pneumoniae was isolated in 176/498 (35.5%) children. The most frequent capsular serotypes were 6B (26.7%) and 19 A (10.7%). 78.4% of isolates corresponded to unvaccinated patients. The non-vaccine application (RR 13.6; CI 95% 3.3-51, p ‹ 0.05) and the use of a single dose and the age over a year (RR 7.3, CI 95% 1.6-45; p ‹ 0.5) were significant.
Conclusions. The percentage of colonization obtained is similar to others reported in Mexico. The strategy of vaccination implemented one year ago in our institution is not reflected in the reported numbers.