1. U.S. Food and Drug Administration. Coronavirus (COVID-19) Update: December 14, 2020. https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-december-14-2020
2. F.D.A. fully approves Pfizer-BioNTech’s vaccine, a first for a Covid-19 shot;LaFraniere;New York Times,2021
3. With F.D.A. approval for a Covid vaccine, the Pentagon and others add vaccine requirements;Slotnik;New York Times,2021
4. COVID-19 transmission in US child care programs;Gilliam;Pediatrics,2021
5. Differences in state COVID-19 vaccine mandates for schoolteachers and childcare professionals;Patel;JAMA Pediatr,2022