[Monitoring the prevalence of Streptococcus pneumoniae in various groups]

Area of Science:

• Microbiology
• Epidemiology
• Molecular Biology

Context:

• Nasopharyngeal carriage of Streptococcus pneumoniae (pneumococcus) is a significant public health concern, particularly in pediatric populations.
• Monitoring pneumococcal prevalence and serotypes is crucial for assessing vaccine effectiveness and guiding public health strategies.
• Banská Bystrica, Slovakia, served as the study location for this epidemiological investigation.

Purpose:

• To determine the prevalence of Streptococcus pneumoniae serotypes in different age groups, with a focus on children in Banská Bystrica, Slovakia.
• To track the presence of pneumococcus in children following vaccination with the heptavalent protein-conjugate vaccine.
• To utilize molecular biology techniques, including PCR and pulsed-field gel electrophoresis, for accurate detection and strain typing.

Summary:

• Cultivation on blood agar plates and standard Quellung reaction were used for S. pneumoniae detection and serotypisation.
• Polymerase Chain Reaction (PCR) facilitated the detection of S. pneumoniae DNA, while pulsed-field gel electrophoresis enabled strain comparison.
• Results indicated a decreasing incidence of pneumococcus with increasing age, with higher prevalence and strain relatedness observed in the youngest children.

Impact:

• Post-vaccination, a shift towards less invasive pneumococcal serotypes was observed, despite similar overall S. pneumoniae incidence.
• The study highlights the importance of ongoing surveillance of Streptococcus pneumoniae due to bacterial variability and potential vaccine-induced type replacement.
• Findings contribute to understanding the long-term impact of pneumococcal conjugate vaccination on nasopharyngeal carriage and serotype distribution.