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Abstract

Streptococcus pneumoniae is one of the pathogenic bacteria causing invasive pneumococcal diseases such as pneumonia, sepsis, and meningitis , which  are commonly reported in children and adults. In this study, we investigated the nasopharyngeal carriage rates, serotype distribution, and antimicrobial susceptibility profiles of S. pneumoniae among children with pneumonia and healthy children under five years old in Padang, West Sumatra, Indonesia.  Nasopharyngeal swabs were collected from 65 hospitalized children with pneumonia in a referral hospital and from 65 healthy children at two Day-care centers from 2018 to 2019. S. pneumoniae was identified by conventional and molecular methods. Antibiotic susceptibility was performed with the disk diffusion method. Out of 130 children, S. pneumoniae strains were carried by 53% and 9.2%  in healthy children (35/65) and children with pneumonia (6/65), respectively. Serotype 19F was the most common serotype among the isolated strains (21%) followed by 6C (10%), 14, 34 (7% each), and 1, 23F, 6A, 6B (5% each). Moreover, 55% of the strains (23/42)  were covered by the 13-valent pneumococcal conjugate vaccine. Most isolates were susceptible to vancomycin (100%), chloramphenicol (93%), clindamycin (76%), erythromycin (71%), and tetracycline (69%). Serotype 19F was commonly found as a multi-drug resistant strain.