
In the study by Casado and colleagues,[1][1] older inpatients with laboratory-confirmed severe and nonsevere influenza were each matched with three controls who had been hospitalized for causes other than acute respiratory diseases. The adjusted effectiveness of influenza vaccination in patients
Case-Control Studies, Influenza, Human, Vaccination, Humans, Aged
Case-Control Studies, Influenza, Human, Vaccination, Humans, Aged
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