The U.K. government plans to offer a first dose of COVID-19 vaccine to every adult by September as the nation’s health service battles the worst crisis in its 72-year-history.

Foreign Secretary Dominic Raab said Sunday that the government is still opening new vaccination sites and will soon begin trials that will give round-the-clock injections at some locations to help increase the pace of delivery.

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Travellers wait for their Covid-19 test results at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country.  (AP PhotoFrank Augstein)

The U.K. government plans to offer a first dose of COVID-19 vaccine to every adult by September as the nation’s health service battles the worst crisis in its 72-year-history.

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country.  (AP PhotoFrank Augstein)

Britain has more than 51 million adults in its population of 67.5 million people.

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas are required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

Britain’s health care system is staggering as doctors and nurses battle a more contagious variant of the coronavirus coupled with cold, wet winter weather that drives people inside, where infections spread more easily.

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

The government says it won’t review the lockdown measures until mid-February, by which time it plans to offer at least one dose of vaccine to everyone over 70, as well as to frontline health care workers and others who are especially vulnerable to COVID-19.

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Britain has approved three vaccines — ones by Pfizer-BioNTech, Oxford-AstraZeneca and Moderna. The first two are already being used, while the Moderna doses are not expected until spring.

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

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Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

People walk past closed stores in London, Saturday, Jan. 16, 2021, during England's third national lockdown since the coronavirus outbreak began. The U.K. is under an indefinite national lockdown to curb the spread of the new variant, with nonessential shops, gyms and hairdressers closed, most people working from home and schools largely offering remote learning. (AP PhotoFrank Augstein)

People walk past closed stores in London, Saturday, Jan. 16, 2021, during England's third national lockdown since the coronavirus outbreak began. The U.K. is under an indefinite national lockdown to curb the spread of the new variant, with nonessential shops, gyms and hairdressers closed, most people working from home and schools largely offering remote learning. (AP PhotoFrank Augstein)

“Our target is by September to have offered all the adult population a first dose,’’ he told Sky News. “If we can do it faster than that, great, but that’s the roadmap.”

Travellers wait for their Covid-19 test results at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country.  (AP PhotoFrank Augstein)

Travellers wait for their Covid-19 test results at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country. (AP PhotoFrank Augstein)

Britain has more than 51 million adults in its population of 67.5 million people.

The ambitious vaccination program comes amid crushing pressures on the National Health Service. Already beleaguered hospitals are admitting another COVID-19 patient every 30 seconds, putting the service in its most precarious situation ever, said Simon Stevens, chief executive of NHS England.

“The facts are very clear and I’m not going to sugarcoat them, hospitals are under extreme pressure and staff are under extreme pressure,’’ he told the BBC. “Since Christmas Day we’ve seen another 15,000 increase in the in-patients in hospitals across England. That’s the equivalent of filling 30 hospitals full of coronavirus patients.”

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country.  (AP PhotoFrank Augstein)

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus, with all travellers to have a negative COVID-19 test to enter the country. (AP PhotoFrank Augstein)

Britain’s health care system is staggering as doctors and nurses battle a more contagious variant of the coronavirus coupled with cold, wet winter weather that drives people inside, where infections spread more easily.

The surge in infections has pushed the number of people hospitalized with COVID-19 to a record 37,475, more than 73% higher than during the first peak of the pandemic in April. Britain has reported 88,747 coronavirus-related deaths, more than any other country in Europe and the fifth-highest number worldwide.

Prime Minister Boris Johnson on Jan. 2 ordered England into its third national lockdown in an effort to slow the spread of the virus and protect the NHS, which Stevens said now has some 50,000 employees off work due to COVID-19 infections and exposure quarantines.

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas are required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas are required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

The government says it won’t review the lockdown measures until mid-February, by which time it plans to offer at least one dose of vaccine to everyone over 70, as well as to frontline health care workers and others who are especially vulnerable to COVID-19.

Once that goal has been reached, the U.K. will offer the vaccine to everyone over 50 before finally moving on to everyone over 18.

Unlike other nations, Britain has chosen to stretch out the time between vaccine doses from 21 days to up to 12 weeks — a decision that means more people will get at least one dose more quickly.

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Britain has approved three vaccines — ones by Pfizer-BioNTech, Oxford-AstraZeneca and Moderna. The first two are already being used, while the Moderna doses are not expected until spring.

Follow AP coverage of the coronavirus pandemic at:

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

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers arrive at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

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

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Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test.(AP PhotoFrank Augstein)

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021.  The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers wait at the Covid-19 testing facility at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

Travellers walk towards the Covid-19 testing centre at Heathrow Airport in London, Sunday, Jan. 17, 2021. The UK will close all travel corridors from Monday morning to protect against the coronavirus with travellers entering the country from overseas required to have proof of a negative Covid test. (AP PhotoFrank Augstein)

People walk past closed stores in London, Saturday, Jan. 16, 2021, during England's third national lockdown since the coronavirus outbreak began. The U.K. is under an indefinite national lockdown to curb the spread of the new variant, with nonessential shops, gyms and hairdressers closed, most people working from home and schools largely offering remote learning. (AP PhotoFrank Augstein)

People walk past closed stores in London, Saturday, Jan. 16, 2021, during England's third national lockdown since the coronavirus outbreak began. The U.K. is under an indefinite national lockdown to curb the spread of the new variant, with nonessential shops, gyms and hairdressers closed, most people working from home and schools largely offering remote learning. (AP PhotoFrank Augstein)