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The prevalence of coronavirus infections in England has halved since March helped by the swift rollout of vaccines, but new variants remain a threat, according to the findings of a closely watched survey released on Thursday.

British Prime Minister Boris Johnson on Monday gave the green light to hugging and the serving of pints inside pubs from next week after months of strict restrictions as he set out the next phase of easing the pandemic lockdown, Reuters reported.

The REACT study, run by scientists at Imperial College London, found that the number of infections has fallen again with an average of only one in 1,000 people infected.

"Today's findings demonstrate the impact our incredible vaccination rollout is having on COVID-19 infection rates across the country," said Matt Hancock, the health minister.

"We're going in the right direction but with variants present, we must continue to exercise caution."

The study does not cover Scotland, Wales and Northern Ireland, which each have their own case tracking.

The REACT study is one of the biggest COVID-19 surveys of its kind in England, with over 127,000 volunteers tested in England between 15 April and 3 May in the latest round.

Overall, national prevalence in England dropped to 0.1% from 0.2% in March. The estimated prevalence is similar across regions of England. Infections are highest among 25-34 year olds at 0.21%, and lowest in the over-75s at 0.05%, the study found.

The data showed 92% of infections were from the B.1.1.7 variant, first detected in England last year, and 7.7% were from the B.1.617.2 variant, first identified in India.

Surge testing is being carried out in areas in England where evidence indicates community spread of infections.