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Implementing an Influenza Vaccine Effectiveness Study in a Hospital Context in ...

Machado, Ausenda; Gomez, Verónica; Panarra, António; Poças, Jose; Corte-Real, Rita; Peres, Maria João; Nunes, Baltazar; EVA Hospital Group

Introduction: The project ‘Integrated Monitoring of Vaccines in Europe’ aimed to measure seasonal influenza vaccine effectiveness against hospitalised adults, aged 65 years and over, with influenza. We describe the protocol implementation in Portugal. Material and Methods: We implemented a test-negative design, targeting community-dwelling patients aged 65 years old and over hospitalised with severe acute respi...


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