COVID-19 vaccines administered in the United States are safe and effective at lowering COVID-19 incidence, death, and hospitalization rates.
1 The federal and local governments have put forward various strategies to increase the vaccination rate, including making the vaccine available to the public free of cost. Nevertheless, the vaccination rate in the US is less than the suggested threshold for herd immunity
2,3 and is falling. Many states have launched incentive programs to boost vaccination, including vaccine lotteries in which a vaccinated individual is eligible to win a big cash prize.