Influenza Activity and Vaccine Effectiveness During the 2021-2022 Season
Influenza viruses typically circulate in the Northern Hemisphere during the winter and spring, but they occasionally can circulate more during the summer months, as did the 2009 H1N1 pandemic strain.
Goad J. Influenza activity and vaccine effectiveness during the 2021-2022 season. Pharmacy Times. 2022, Jul 18. https://www.pharmacytimes.com/view/influenza-activity-and-vaccine-effectiveness-during-the-2021-2022-season