Related Experiment Video
Updated: Jun 4, 2025
Experimental Human Pneumococcal Carriage
Published on: February 15, 2013
Pneumococcal carriage in a large Sicilian sample population: impact on the current epidemiological scenario and
Emanuele Amodio1, Fabio Tramuto1,2, Valerio De Francisci1
1Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties "P. Giaccone", University of Palermo, Palermo, Italy.
Introduction:
Streptococcus pneumoniae is a prevalent and virulent global pathogen, with colonization being considered a precondition for pneumococcal disease. Understanding colonization is critical for gaining insights into transmission dynamics and developing effective interventions. This study aimed to determine the prevalence of nasopharyngeal colonization and serotype distribution in the Sicilian population.
Methods:
Observational study randomly selecting samples belonging to Sicilian individuals whose nasopharyngeal swabs were collected between February 1, 2020, and December 31, 2022. Pneumococcal colonization was determined using PCR for the pneumococcal autolysin (LytA) gene, and positive samples were serotyped.
Results:
The study sample consisted of 1,196 individuals, with 17.4% testing positive for the LytA gene. Pneumococcal colonization rates fell from birth to 24 years, with a peak in 0-4-year-olds (aOR=6.9; p<0.001). Colonization was higher in colder months, particularly in December (aOR=2.9, p<0.05) and February (aOR=4, p<0.05). Serotypes 22F and 24ABF exhibited strong colonization and an invasive pneumococcal disease (IPD) risk, whereas serotypes 4, 6AB, 9VA, and 13 had high colonization but a low IPD risk. Serotypes 3 and 8 exhibited considerable IPD risk but low colonization.
Conclusion:
Our findings provide insights into pneumococcal colonization mechanisms, influencing serotype prevalence, colonization risk variables, and serotype comparisons for colonization and pathogenicity propensity.
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