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Comparing two case definitions for including severe acute respiratory infection patients in influenza and COVID-19 vaccine effectiveness studies among older adults using the test-negative design: VEBIS hospital network, seven European countries, 2023/24.

Comparing two case definitions for including severe acute respiratory infection patients in influenza and COVID-19 vaccine effectiveness studies among older adults using the test-negative design: VEBIS hospital network, seven European countries, 2023/24.

Coronavirus Literature
Publication date: Oct 13, 2026 Two severe acute respiratory infection (SARI) case definitions (CDs) are often used in test-negative design (TND) hospital-based vaccine effectiveness (VE) studies. SARI-CD1 requires ≥1 symptom ... Read more