Influenza vaccine effectiveness against hospitalization in children aged 6-72 months: a test-negative study in the Southern Italy, 2022-2026.
BACKGROUND Seasonal influenza is an important cause of hospitalization in young children, yet real-world evidence on vaccine effectiveness (VE) against severe outcomes remains limited in Italy. We estimated influenza VE against influenza-associated hospitalization among children aged 6-72 months in the district of Fogg...