Five million in the U.K. have gotten a vaccine and officials hint the variant may be more deadly, though it’s too soon to tell.

For weeks, Britain has reported alarming coronavirus death numbers, hospitals have continued to fill up, and fears have risen that it will take months to control the spread of a more transmissible variant first detected in the Kent region of England last year.

On Friday, Prime Minister Boris Johnson said at a news conference the new variant may also be associated with a slightly higher chance of death, even as he acknowledged it was too soon to be sure, and his own scientific advisers urged restraint in interpreting preliminary evidence.

Patrick Vallance, the government’s chief scientific adviser, said that the data indicating an increase in the risk of death in those infected with the new variant are preliminary and based on small numbers. The absolute risk of dying from Covid-19 still remains low.

“That evidence is not yet strong, it’s a series of different bits of information that come together to support that,” Mr. Vallance said.

Referring to the country’s overstretched National Health Service, Mr. Johnson said that “it’s largely the impact of this new variant that means the N.H.S. is under such intense pressure.”

Yet as Britain’s top health authorities have warned about grim weeks ahead, the latest vaccination figures have offered a glimmer of hope: Nearly 5.5 million people had received a first vaccine dose in Britain as of Friday, according to government data. That amounts to about 8 percent of the population.

By comparison, the United States has vaccinated around 4.5 percent of its population, and most European countries have vaccinated less than 2 percent.

Fewer than 500,000 people in Britain have received a second injection, as the National Health Service is prioritizing first injections and second doses are being given up to 12 weeks after the first. England’s chief medical officer, Chris Whitty, said the first shot of the Pfizer-BioNTech and Astra Zeneca vaccines gave a “great majority of the protection.”

Since the authorities imposed new lockdown restrictions in England this month, Britain has reported its highest daily death figures. The country remains one of the worst-hit in Europe. and the authorities have said that England’s lockdown could remain in place throughout the spring.

“We will have to live with the coronavirus, one way or another, for a long time to come,” Mr. Johnson said on Friday.

The situation is so bleak that, according to British news reports, the authorities are considering offering £500 (about $680) to anyone testing positive for the virus to help them stay in quarantine for the full 10 days, which many currently do not.

There are also fears that cuts in vaccine deliveries from Pfizer, which is retooling a major manufacturing plant in Belgium, may slow down the vaccination campaign, and that variations in vaccination rates are putting some areas of the country at a disadvantage.

In Britain, a racecourse, rugby fields and religious buildings have been turned into vaccination centers, and shots are also being given at 1,200 hospitals and medical offices. More than two million people were vaccinated in the past seven days, twice as many as two weeks ago.

At that rate, Britain could still fall short of its goal to vaccinate 13.9 million people by mid-February, but the authorities have said they can reach the target if they continue to increase the pace.

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