Instituto de Atención Pediátrica, San José, Costa Rica;
Instituto de Atención Pediátrica, San José, Costa Rica;
Universidad de Ciencias Médicas, San José, Costa Rica;
Pediatric Infectious Disease Unit, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel;
Streptococcus; pneumoniae; Serotypes; Nasopharynx; Oropharynx; Pneumococcal; Conjugated; Vaccine;