The Canadian Sentinel Practitioner Surveillance Network reports mid-season 2023/24 influenza vaccine effectiveness (VE) of 63% (95% CI: 51-72) against influenza A(H1N1)pdm09, lower for clade 5a.2a.1 (56%; 95% CI: 33-71) than clade 5a.2a (67%; 95% CI: 48-80), and lowest against influenza A(H3N2) (40%; 95% CI: 5-61). The Omicron XBB.1.5 vaccine protected comparably well, with VE of 47% (95% CI: 21-65) against medically attended COVID-19, higher among people reporting a prior confirmed SARS-CoV-2 infection at 67% (95% CI: 28-85).
10.2807/1560-7917.ES.2024.29.7.2400076
Journal article
Euro Surveill
02/2024
29
Influenza, Omicron, SARS-Co-V-2, XBB.1.5, observational study, test-negative design, vaccine effectiveness, Humans, Influenza, Human, Seasons, Influenza A Virus, H1N1 Subtype, Influenza A Virus, H3N2 Subtype, Vaccine Efficacy, Canada, Influenza Vaccines, Sentinel Surveillance, COVID-19, Vaccination, Case-Control Studies