Molecular Analysis of Influenza A (A/H3N2) Viruses Indicates Antigenic Drift in the Receptor Binding Domain and Potential Vaccine Mismatch Among Strains in Riyadh, Saudi Arabia, 2024–2025 - Report - MDSpire
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Molecular Analysis of Influenza A (A/H3N2) Viruses Indicates Antigenic Drift in the Receptor Binding Domain and Potential Vaccine Mismatch Among Strains in Riyadh, Saudi Arabia, 2024–2025
Clinical Report: Molecular Analysis of Influenza A (A/H3N2) Viruses in Riyadh
Overview
This study reveals significant antigenic drift in A/H3N2 viruses in Riyadh, Saudi Arabia, during the 2024–2025 season, indicating potential vaccine mismatch. The findings underscore the necessity for ongoing surveillance and timely vaccine reformulation to enhance public health responses.
Background
Influenza A viruses are a leading cause of respiratory illness globally, with A/H3N2 subtypes exhibiting notable antigenic drift. This drift complicates vaccine effectiveness, necessitating continuous monitoring to inform vaccine updates. The unique epidemiological context of Saudi Arabia, characterized by mass gatherings and high population mobility, further emphasizes the importance of understanding local viral dynamics.
Data Highlights
No numerical data available in the source material.
Key Findings
Antigenic drift was observed in the receptor binding domain of A/H3N2 viruses.
Potential vaccine mismatch was identified among circulating strains in Riyadh.
Prevalence of A/H3N2 viruses was assessed through molecular characterization of isolates.
Amino acid substitutions were noted within key antigenic sites, impacting vaccine strain compatibility.
N-glycosylation patterns were evaluated to understand their role in antigenicity.
Clinical Implications
Healthcare professionals should remain vigilant regarding the evolving nature of influenza viruses, particularly A/H3N2. Continuous genetic and antigenic monitoring is essential for timely vaccine updates, which can significantly impact public health outcomes during influenza seasons.
Conclusion
The findings from this study highlight the critical need for ongoing surveillance of A/H3N2 viruses in Riyadh to inform vaccination strategies and mitigate the impact of influenza epidemics.
by Shatha Ata Abdulgader, Ibrahim M. Aziz, Abdulhadi M. Abdulwahed, Mohamed A. Farrag, Reem M. Aljowaie, Abdulaziz M. Almuqrin, Noorah A. Alkubaisi, Fahad N. Almajhdi
Pragmatic cluster randomized crossover study found no statistically significant difference in laboratory-confirmed influenza during the 2023-2024 season
