1. Influenza (Seasonal). World Health Organization.https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal). Published November 6 2018. Accessed September 3 2019.
2. Global influenza surveillance and response system (GISRS). World Health Organization.https://www.who.int/initiatives/global-influenza-surveillance-and-response-system. Accessed August 8 2022.
3. Ten threats to global health in 2019. World Health Organization.https://www.who.int/news-room/spotlight/ten-threats-to-global-health-in-2019. Accessed August 8 2022.
4. Global epidemiological surveillance standards for influenza. World Health Organization.https://www.who.int/publications/i/item/9789241506601. Published 2013. Accessed August 8 2022.
5. Sentinel surveillance. World Health Organization.https://www.who.int/immunization/monitoring_surveillance/burden/vpd/surveillance_type/sentinel/en/. Accessed June 24 2019.