1. National Institute of Allergy and Infectious Diseases Universal influenza vaccine research.
https://www.niaid.nih.gov/diseases-conditions/universal-influenza-vaccine-research
. Accessed 7 December 2021.
2. Centers for Disease Control and Prevention Past seasons vaccine effectiveness estimates.
https://www.cdc.gov/flu/vaccines-work/past-seasons-estimates.html
. Accessed 7 December 2021.
3. World Health Organization Influenza (Seasonal) (
2018
)
https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal
). Accessed 7 December 2021.
4. Influenza Research Database World Health Organization recommendations for composition of influenza vaccines.
https://www.fludb.org/brc/vaccineRecommend.spg?decorator=influenza
. Accessed 7 December 2021.
5. Centers for Disease Control and Prevention Quadrivalent influenza vaccine.
https://www.cdc.gov/flu/prevent/quadrivalent.htm
. Accessed 7 December 2021.