Seasonal influenza causes substantial morbidity and mortality worldwide, with an estimated one billion cases annually, including 3 to 5 million cases of severe illness, particularly among older adults, young children under five, pregnant women, and individuals with chronic medical conditions.
Beyond health impacts, influenza epidemics also strain socio-economic conditions. While many of these impacts can be mitigated through targeted interventions, particularly seasonal influenza vaccination, concrete evidence of disease burden is essential to inform such measures.
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