America was battered by a spike in cases and deaths after the end-of-year holidays, but since January new infections have come down as vaccination rates have jumped.
"We are turning the corner. We have 58 per cent of adult Americans with at least one shot, over 110 million Americans fully vaccinated," White House Covid-19 coordinator Jeffrey Zients told CNN's State of the Union.
President Joe Biden wants 70 per cent of adults in the US to have received at least one shot of the Covid-19 vaccine by the 4 July, the independence day of the US.
But the rate peaked around 10 April and has been declining since then, with vaccine hold-outs slowing the race to population immunity.
Federal, state and local officials are partnering with pharmacies, restaurants, breweries, supermarkets and sports teams to come up with incentives to get people to get their shots.
In New Jersey, governor Phil Murphy launched a "Shot and a Beer" program to encourage vaccination, while in West Virginia Governor Jim Justice announced that the state will offer $100 savings bonds to residents aged 16 to 35 who get inoculated.