https://www.who.int/publications/i/item/9789240116337?utm_
https://pmc.ncbi.nlm.nih.gov/articles/PMC12558087/?utm_source=chatgpt.com
https://www.cdc.gov/acip-recs/hcp/vaccine-specific/flu.html?utm_source=chatgpt.com
https://www.researchgate.net/publication/395035352_Prevention_and_Control_of_Seasonal_Influenza_with_Vaccines_Recommendations_of_the_Advisory_Committee_on_Immunization_Practices_-_United_States_2025-26_Influenza_Season?utm_source=chatgpt.com