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Invasive Pneumococcal Infections Among Moroccan Children: Pneumococcal Vaccination Challenges in the Mature Vaccine
Insights
Invasive pneumococcal disease (IPD) persists in Moroccan children, with non-vaccine serotypes like 3 and 19A posing challenges. Updated vaccination strategies are crucial for effective prevention.
Area of Science:
- Microbiology
- Epidemiology
- Public Health
Background:
- Streptococcus pneumoniae causes significant global morbidity and mortality, particularly in vulnerable populations.
- Serotype replacement remains a challenge despite vaccination, necessitating updated public health strategies for invasive pneumococcal diseases (IPD).
Purpose of the Study:
- To assess pneumococcal serotype distribution and antibiotic sensitivity in hospitalized children in Morocco.
- To evaluate the impact of current vaccination coverage on IPD epidemiology in the post-vaccination era.
Main Methods:
- Analysis of 74 Streptococcus pneumoniae strains from hospitalized children between 2019 and 2022.
- Assessment of serotype prevalence, antibiotic susceptibility, and vaccine coverage (PCV-10, PCV-13).
Main Results:
- Meningitis/meningo-encephalitis was prevalent in 66% of cases, with serotypes 3, 19A, 6B, 14, and 11 being most common.
- PCV-10 and PCV-13 coverage was 20.27% and 56.75%, respectively. 43% of strains were non-vaccine types, with serotypes 3 and 19 contributing significantly to infections.
- Penicillin non-susceptible Streptococcus pneumoniae (PNSP) accounted for 31.3% of strains, predominantly non-vaccine types.
Conclusions:
- IPD remains a significant concern in Moroccan children, with notable challenges from non-vaccine serotypes.
- The efficacy of PCV-13 against prevalent non-vaccine serotypes (3, 19A) requires ongoing evaluation.
- Continuous surveillance and adaptive vaccination strategies are essential to address serotype replacement and improve IPD prevention.
Background:
Streptococcus pneumoniae, a major contributor to global morbidity and mortality, disproportionately affects children, the elderly, and immunocompromised individuals. Despite vaccination efforts, the challenge of serotype replacement highlights the ongoing struggle against invasive pneumococcal diseases (IPD) in Morocco, emphasizing the need for updated public health strategies and vaccine efficacy assessments.
Methods:
This study was conducted at the Ibn Rochd University Hospital Center and the Mohammed VI University Hospital Center from 2019 to 2022, focusing on hospitalized children. It involved the analysis of 74 strains of IPD, assessing the distribution of pneumococcal serotypes and their antibiotic sensitivity in the post-vaccination era.
Results:
The prevalence of meningitis or meningo-encephalitis was found to be 66% among the study subjects, with the most frequent serotypes being 3, 19A, 6B, 14, and 11. These serotypes varied significantly by age and location. Coverage rates for the pneumococcal conjugate vaccines, PCV-10 and PCV-13, were 20.27% and 56.75%, respectively. Notably, 43% of the strains were non-vaccine serotypes, with serotypes 3 and 19 accounting for 36% of the infections in children, indicating a lack of vaccine efficacy against these types. Additionally, 31.3% of the strains were Penicillin non-susceptible Streptococcus pneumoniae (PNSP), with 81.25% associated with non-vaccine serotypes.
Conclusions:
This study highlights the persistence of IPD in Moroccan children, revealing significant challenges despite vaccination efforts. With the reintroduction of PCV-13, concerns about the efficacy against non-vaccine serotypes, particularly 3 and 19A, remain. Continuous surveillance and adaptable vaccination strategies are essential to combat these serotype replacements and ensure the effectiveness of future preventive measures.
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