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Maoula Jan, 52, who is British and originally from Afghanistan receives his second dose of the Pfizer coronavirus vaccine from volunteer vaccinator Steve Kriss, at a vaccine centre in the Swaminarayan School in Neasden, north London, Saturday, May 1, 2021. (Photo: AP/Matt Dunham) - 

Prime Minister Boris Johnson said on Friday (May 14) Britain would accelerate its COVID-19 vaccination programme, to try to contain a fast-spreading variant first identified in India that could knock a re-opening of the economy off track.

The United Kingdom has delivered one of the world's fastest inoculation campaigns, giving a first shot to almost 70 per cent of the adult population and a second to 36 per cent, helping to reduce infection rates and deaths.

But the emergence of the B16172 variant in parts of northern England and London has prompted some scientists to call for the reopening to be delayed, and a rethink on the speed of the vaccine rollout.

"I believe we should trust in our vaccines to protect the public whilst monitoring the situation very closely because the race between our vaccination programme and the virus may be about to become a great deal tighter," Johnson told a news conference.

He said the government would accelerate remaining second doses to the over 50s and those clinically vulnerable to just eight weeks after the first dose, and would prioritise first doses for those eligible who had not yet come forward.

Even so, the spread of the variant could disrupt Britain's progress out of lockdown, making it more difficult to move to the final stage of a staggered reopening of the economy in June, he said.

Johnson had aimed to lift all restrictions on Jun 21, after allowing people in England from Monday to hug again, meet in small groups indoors and travel abroad.

Chris Whitty, England chief medical officer, said there was now confidence that B16172 was more transmissible than the "Kent" variant that fuelled England's second wave of infections. He said B16172 could come to dominate in Britain.

Whitty said so far there had not been a significant increase in hospitalisations from the variant, which may be because more people had been vaccinated.

But both Johnson and Whitty said it was still early days, and scientists would need to scrutinise data over the next two or three weeks to truly see the impact of the variant.

Britain put India on a travel "red list" in April, meaning all arrivals from India - now suffering the world's worst wave of COVID-19 - would have to pay to quarantine in a government-approved hotel for 10 days.

Media reports at the time suggested that, because the quarantine requirement was announced four days in advance, many people had sought to fly beforehand. Britain has a large South Asian community.

Even with new variants, the government is likely to want to avoid repeating the regional curbs used last year, which ultimately failed to prevent two further national lockdowns.

At the national level, infections are still low, and fell for a fifth consecutive week in England, Office for National Statistics (ONS) figures showed on Friday//CNA