Streptococcus pneumoniae serotypes isolated from the middle ear of Mexican children diagnosed with acute otitis media

Objective.The aim of this study was to identify the etiology and the serotypes of S. pneumoniae (Sp) in Mexican children with acute otitis media (AOM). Materials and Methods.The study includes samples from patients diagnosed with AOM at the Federico Gomez Children's Hospital of Mexico (2002-2003), with positive culture for Sp bacteriologically confirmed in middle ear fluid obtained by tympanocentesis.All Sp were serotyped. A total of 138 samples from 135 children with AOM were included. Results. Sp was isolated in 72 samples from 70 children. Sixty (85.7%) were previously healthy and 10 (14.3%) were immunocompromised. The most common serotypes were 6B and 19F (16.67%), and 6A, 14 and 23F (15.27%). Conclusion.The distribution of serotypes among the children with AOM in the study is similar to that reported in developing cities, and 63.9% of the isolated serotypes are found to be included in the 7-Valent Pneumococcal Conjugate Vaccine (PCV), 68.1% in the 10-Valent PCV and 83.3% in 13-Valent PCV.