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Ashish K. Jha, MD, MPH on Twitter. (n.d.). Twitter. Retrieved February 2, 2022, from https://twitter.com/ashishkjha/status/1487868684412628996

Health Nerd. (2022, January 15). It was always likely that immunity to COVID-19 would wane, and we now know the median time to waning is around 1.5-2 years post infection for most people, sometimes less 😕 [Tweet]. @GidMK. https://twitter.com/GidMK/status/1482188340091060229