Influenza vaccine effectiveness against influenza-associated hospitalization in Hong Kong children aged 9 months to 17 years, March-June 2023.
Benjamin John CowlingMike Y W KwanCaitriona MurphyEunice L Y ChanJoshua S C WongSheena G SullivanMalik PeirisSo-Lun LeePublished in: Journal of the Pediatric Infectious Diseases Society (2023)
In March-June 2023 we conducted a test negative study in 1671 children who were hospitalized with acute respiratory illness in Hong Kong. 286 (17.2%) tested positive for influenza virus including 188 with A(H1N1). We estimated influenza vaccine effectiveness against influenza-associated hospitalization as 69.6% (95% confidence interval: 49.3%, 81.7%).