Source: Fauci, A., “It Would be Terrible if People Choose Not to Get COVID-19 Vaccine,” (interview by Martin, R., National Public Radio, December 15, 2020), available at https://www.npr.org/2020/12/15/946617217/fauci-it-would-be-terrible-if-people-choose-not-to-get-covid-19-vaccine; and “Coronavirus Disease (COVID-19): Herd Immunity, Lockdowns and COVID-19,” World Health Organization, December 31, 2020, available at https://www.who.int/news-room/qa-detail/herd-immunity-lockdowns-and-covid-19.