British Prime Minister Boris Johnson is expected to confirm Monday that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India.

While hosting the Group of Seven summit in southwest England, Johnson conceded over the weekend that he had grown more pessimistic about the government lifting remaining limits on social contact on June 21 after daily cases reported across the U.K. hit levels not seen since February.

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FILE - In this Monday, April 12, 2021 file photo, people carry shopping bags while others queue to enter a store on Oxford Street in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoKirsty Wigglesworth, File)

British Prime Minister Boris Johnson is expected to confirm Monday that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India.

FILE - In this Tuesday, March 3, 2020 file photo, Britain's Prime Minister Boris Johnson reacts during a press conference at Downing Street on the government's coronavirus action plan in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoFrank Augstein, Pool, File)

With the delta variant estimated by some health experts to be at least 60% more contagious than the previous dominant strain, British scientists and doctors urged the prime minister to err on the side of caution and postpone implementing the fourth stage of his government’s four-step unlocking plan for England.

FILE - In this Saturday, Feb. 13, 2021 file photo, Britain's Prime Minister Boris Johnson, wearing a face mask to prevent the spread of the coronavirus, visits a PPE manufacturing facility during a visit to the north east of England, in Seaton Delaval, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoScott Heppell, Pool, File)

“I think it’s clear we will have a substantial third wave of infections, the really big question is how much that wave of infections is going to translate into hospitalizations,” Hayward told the BBC.

FILE - In this Monday, April 12, 2021 file photo, a waitress serves drinks at a cafe in the Soho area of London, as restaurants, bars and pubs can open and serve people who can be seated outside. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoAlastair Grant, File)

The U.K.'s vaccine rollout has won plaudits as one of the world's speediest and most coherent. As of Sunday, around 62% of the British population had received one shot, while about 44% had gotten the two needed to produce what health experts consider an acceptable level of immunity.

FILE - In this Monday, April 12, 2021 file photo, a customer holding his dog orders outside a restaurant in Liverpool, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo Jon Super, File)

The improved backdrop led to the loosening of lockdown restrictions, with stores, theaters, gyms and most sectors of the economy operating within social distancing guidelines. The four nations of the U.K. — England, Scotland, Wales and Northern Ireland — have lifted restrictions at different paces but generally pursued similar plans.

FILE - In this Tuesday, March 24, 2020 file photo, two people wearing masks stand at the top of a bank of escalators in London's Waterloo Station. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoMatt Dunham, File)

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“Clearly, what you’ve got is a race between the vaccines and the virus, and the vaccines are going to win,” he told the BBC. “It’s just a question of pace.”

FILE - In this Monday, April 12, 2021 file photo, people carry shopping bags while others queue to enter a store on Oxford Street in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoKirsty Wigglesworth, File)

FILE - In this Monday, April 12, 2021 file photo, people carry shopping bags while others queue to enter a store on Oxford Street in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoKirsty Wigglesworth, File)

With the delta variant estimated by some health experts to be at least 60% more contagious than the previous dominant strain, British scientists and doctors urged the prime minister to err on the side of caution and postpone implementing the fourth stage of his government’s four-step unlocking plan for England.

Under his government's road map, nightclubs were set to reopen for the first time since the pandemic struck in March 2020 and all other legal limits on social contact were due to be scrapped by June 21 at the earliest, if coronavirus trends supported the moves.

Professor Andrew Hayward, an epidemiologist from University College London who is a member of a group advising the government, said that removing remaining restrictions could “fan the flames” of rising infections. He compared the process to driving a car around a bend without knowing what was around the corner.

FILE - In this Tuesday, March 3, 2020 file photo, Britain's Prime Minister Boris Johnson reacts during a press conference at Downing Street on the government's coronavirus action plan in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoFrank Augstein, Pool, File)

FILE - In this Tuesday, March 3, 2020 file photo, Britain's Prime Minister Boris Johnson reacts during a press conference at Downing Street on the government's coronavirus action plan in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoFrank Augstein, Pool, File)

“I think it’s clear we will have a substantial third wave of infections, the really big question is how much that wave of infections is going to translate into hospitalizations,” Hayward told the BBC.

On Sunday, the British government reported 7,490 new confirmed cases, one of the highest daily numbers since the end of February. While daily infections have increased threefold over the past few weeks, they are still way down from the nearly 70,000 cases recorded in January at the peak of the pandemic’s second wave.

Still, the speed at which cases have been rising put pressure on Johnson to delay, potentially for four weeks or longer, so more people can get vaccinated before what has been dubbed by sections of the British media as “Freedom Day.”

FILE - In this Saturday, Feb. 13, 2021 file photo, Britain's Prime Minister Boris Johnson, wearing a face mask to prevent the spread of the coronavirus, visits a PPE manufacturing facility during a visit to the north east of England, in Seaton Delaval, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoScott Heppell, Pool, File)

FILE - In this Saturday, Feb. 13, 2021 file photo, Britain's Prime Minister Boris Johnson, wearing a face mask to prevent the spread of the coronavirus, visits a PPE manufacturing facility during a visit to the north east of England, in Seaton Delaval, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoScott Heppell, Pool, File)

The U.K.'s vaccine rollout has won plaudits as one of the world's speediest and most coherent. As of Sunday, around 62% of the British population had received one shot, while about 44% had gotten the two needed to produce what health experts consider an acceptable level of immunity.

The government's aim is to have offered every adult in the U.K. one vaccine dose by the end of July. The devolved administration in Wales said it will have offered one jab to every adult by Monday, six weeks ahead of schedule.

The rapid rollout of vaccines and a strict months-long lockdown helped drive down the number of virus-related deaths in the U.K. in recent months. Despite that, the country has recorded nearly 128,000 deaths in the pandemic, more than any other nation in Europe.

FILE - In this Monday, April 12, 2021 file photo, a waitress serves drinks at a cafe in the Soho area of London, as restaurants, bars and pubs can open and serve people who can be seated outside. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoAlastair Grant, File)

FILE - In this Monday, April 12, 2021 file photo, a waitress serves drinks at a cafe in the Soho area of London, as restaurants, bars and pubs can open and serve people who can be seated outside. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoAlastair Grant, File)

The improved backdrop led to the loosening of lockdown restrictions, with stores, theaters, gyms and most sectors of the economy operating within social distancing guidelines. The four nations of the U.K. — England, Scotland, Wales and Northern Ireland — have lifted restrictions at different paces but generally pursued similar plans.

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https://apnews.com/hub/coronavirus-pandemic

FILE - In this Monday, April 12, 2021 file photo, a customer holding his dog orders outside a restaurant in Liverpool, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo Jon Super, File)

FILE - In this Monday, April 12, 2021 file photo, a customer holding his dog orders outside a restaurant in Liverpool, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo Jon Super, File)

https://apnews.com/hub/coronavirus-vaccine

FILE - In this Tuesday, March 24, 2020 file photo, two people wearing masks stand at the top of a bank of escalators in London's Waterloo Station. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoMatt Dunham, File)

FILE - In this Tuesday, March 24, 2020 file photo, two people wearing masks stand at the top of a bank of escalators in London's Waterloo Station. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP PhotoMatt Dunham, File)