Offering people £20 to get a Covid vaccine or drive someone to their appointment can boost uptake, a study suggests.
Researchers at the North Carolina Department of Health and Human Services found the payments encouraged more low-income, Hispanic and black people to show up at jabbing centres.
Britain currently has no official financial incentives in place to boost uptake, despite rates being lower among BAME groups. But some firms such as Deliveroo and Uber offer discounts to people who get the vaccine.
Up to 4.2million adults are yet to be jabbed at all, including around 700,000 over-50s.
The US already has vaccine incentives in place, including entering fully immunised Americans into $1mililion (£725,000) lotteries.
A woman received a Covid vaccine at the Birkenhead Medical Building in Merseyside on Saturday
The NCDHHS, which is responsible for ensuring the health and safety of people in North Carolina, launched a two-week pilot incentive programme in June that gave $25 (£18) to adults who received or drove someone to their appointment for a first Covid dose.
Over the course of the scheme, 2,890 people received the cash for getting their first dose, while 1,374 people received it for driving others to their jab booking.
Among sites offering the scheme, the number of people coming forward for the vaccine dropped by around 26.4 per cent between May and June.
But it dropped slower than the county average, where rates declined by 51.1 per cent, and less than the state average, where there was a drop of 48.6 per cent.
In their paper published in JAMA Internal Medicine, experts said the small financial incentive is ‘a potentially promising strategy to increase Covid vaccination uptake’.
The cash ‘slowed the decline in vaccination and promoted more equitable distribution’, especially for low-income, black and Hispanic people.
The team wrote: ‘With vaccination rates lagging in areas with higher social vulnerability, small financial incentives should be considered in conjunction with other equity-promoting strategies.
‘The social incentive of cash cards for drivers may also encourage people to help get their friends and family vaccinated, a powerful motivator for those undecided about vaccination.
‘With hundreds of millions of dollars being spent to accelerate Covid vaccine uptake, these study findings suggest that this strategy for increasing vaccination merits greater investment.’
But they noted that it needs to be establish whether the findings could be applied elsewhere.
Among 401 people who were quizzed about their participation in the scheme, 41 per cent said the cash was an important reason for vaccination.
People were more likely to say the cash was a motivator if they were of Hispanic or ‘other’ ethnicity compared to white people.
And people with an income below $40,000 (£29,000) had a higher chance of saying the cash was important for them getting the vaccine.
Nine per cent said they only came forward for the vaccine because of the reward.
Some 15 per cent said they waited to get vaccinated until they found a way to get an incentive for doing so.
And 49 per cent of people said getting driven to their vaccination appointment was an important reason for getting the jab, with black, Hispanic and lower income individuals more likely to say the lift was essential.
It comes as ministers face calls to persuade 5million Britons who have yet to have a single vaccine to come forward.
Some 13.6 per cent of over-12s in the UK remain unvaccinated, while millions who are eligible are yet to come forward for a booster jab.
Extending the jab roll-out is a key part of the Government’s plan to suppress cases, hospitalisations and deaths this winter.