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Observational analysis estimated vaccine effectiveness against hospitalization in older adults, highlighting its significance across winter and summer waves.
Background We estimated vaccine effectiveness (VE) of the COVID-19 monovalent XBB.1.5 vaccine recommended in Spain in October 2023 for ≥60-year-olds against medically-attended COVID-19 and COVID-19 hospitalization, during winter and summer epidemic waves.
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Rojas‐Benedicto et al. (2025) studied this question.
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