A safe and effective vaccine against coronavirus disease 2019 (COVID-19) is the best way to control and ultimately end the pandemic. Vaccine development is moving at unprecedented speed, with more than 200 candidates, billions of dollars committed, and manufacturing often proceeding before even knowing whether a given vaccine candidate will succeed. To date, the US federal government has rapidly advanced 5 vaccine candidates through Operation Warp Speed.1 At the same time, a growing movement of skeptics has raised doubt about future COVID-19 vaccines.2 A poll of 1056 individuals in the US found that only 49% reported that they currently are planning to receive a COVID-19 vaccine; 31% are uncertain, and 20% are not, with safety a major concern.3