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Updated: Oct 5, 2026

Experimental Human Pneumococcal Carriage
Published on: February 15, 2013
Investigation of risk factors for penicillin-resistant Streptococcus pneumoniae carriage in Turkish children
1Ankara University Medical School, Department of Paediatrics, Ankara, Turkey. erginciftci@doctor.com
Insights
Day-care attendance and upper respiratory infections increase Streptococcus pneumoniae colonization risk in children. Antibiotic use, crowded housing, and young siblings are key factors for penicillin-resistant S. pneumoniae carriage.
Area of Science:
- Microbiology
- Epidemiology
- Pediatrics
Background:
- Nasopharyngeal colonization by Streptococcus pneumoniae is a significant factor in pneumococcal infections.
- The rise of penicillin resistance in S. pneumoniae complicates treatment strategies for these infections.
Purpose of the Study:
- To identify risk factors associated with nasopharyngeal colonization by S. pneumoniae.
- To determine risk factors for colonization with penicillin-resistant strains of S. pneumoniae.
Main Methods:
- Investigated 300 children for various risk factors, with or without infection.
- Assessed penicillin susceptibility of S. pneumoniae isolated from nasopharyngeal swabs.
Main Results:
- Day-care attendance (OR=2.82) and recent upper respiratory tract infection (OR=1.83) are risk factors for S. pneumoniae carriage.
- Antibiotic use within 3 months (OR=81.07), >5 household members (OR=6.63), and having a sibling under 5 (OR=4.60) are risk factors for penicillin-resistant S. pneumoniae carriage.
Conclusions:
- Children are susceptible to colonization with both penicillin-susceptible and resistant S. pneumoniae.
- Strategies to mitigate colonization include optimizing day-care settings, improving living conditions, and judicious antibiotic use.
Background:
Nasopharyngeal colonization plays an important role for infections caused by Streptococcus pneumoniae. Emergence of penicillin resistance in this organism has made it difficult to treat pneumococcal infections. The objectives of this study were to investigate the risk factors for nasopharyngeal colonization with S. pneumonia and for nasopharyngeal colonization with penicillin-resistant S. pneumoniae.
Methods:
Three hundred children with or without evidence of infection were investigated for various risk factors. Streptococcus pneumoniae isolated from children's nasopharyngeal swabs were examined for penicillin susceptibility.
Results:
Day-care attendance (odds ratio OR=2.82, P=0.003) and upper respiratory tract infection within the last month (OR=1.83, P=0.02), have been determined to be risk factors for S. pneumoniae carriage. The use of antibiotics within the last 3 months (OR=81.07, P<0.001), the presence of more than five people living in the house of the child (OR=6.63, P=0.03), and having a sibling under 5-years-old (OR=4.60, P=0.03) have been determined to be risk factors for penicillin-resistant S. pneumoniae carriage.
Conclusion:
Some children are inevitably exposed to and colonized with penicillin susceptible or resistant S. pneumoniae. Changes in day-care organizations, better living conditions, and restriction of antibiotic use seems to be useful precautions to prevent the emerging and colonization with penicillin-susceptible or -resistant S. pneumoniae.
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