[Articles] Brand-specific influenza vaccine effectiveness in three Nordic countries during the 2024–2025 season: a target trial emulation study based on registry data

Seasonal influenza vaccines moderately reduced the risk of severe outcomes in older adults. Efluelda Tetra and Fluad Tetra appeared to offer favourable protection in their respective target groups, supporting their use in the 2025/2026 season. Annual monitoring using Nordic registries is crucial for informing evidence-based vaccination strategies and regulatory decisions.