A head nurse at a Tennessee hospital dramatically fainted minutes after receiving Pfizer’s Covid-19 mRNA vaccine on Dec. 17, 2020. Tiffany Dover, a nurse manager at CHI Memorial Hospital, received the vaccine injection live on television before addressing the news media. US Vice President Mike Pence receives the COVID-19 vaccine in the Eisenhower Executive Office Building in Washington, DC, December 18, 2020. (Photo by SAUL LOEB/AFP via Getty Images)