Doctors in Britain urged the government to halve the 12-week gap between giving people the first and second shots of the Pfizer-BioNTech Covid-19 vaccine.
Current policy is focused on administering a first dose of the vaccine to as many people as possible to give some initial protection.
This is despite Pfizer and BioNTech issuing a warning that there was no evidence their vaccine would offer protection against the virus if the second dose was given more than three weeks later.
The British Medical Association, a trade union for doctors and medical students in the UK, asked England's chief medical officer, Prof Chris Whitty, to "urgently review" the policy.
"The UK's strategy has become increasingly isolated from many other countries," the association said.
“BMA members are also concerned that, given the unpredictability of supplies, there may not be any guarantees that second doses of the Pfizer vaccine will be available in 12 weeks’ time.”
Yvonne Doyle, medical director of Public Health England, defended the policy as "a reasonable scientific balance on the basis of both supply and also protecting the most people".
The UK is also using the vaccine developed by AstraZeneca, which supported the gap between doses.
On Saturday, Britain had recorded 97,329 deaths among people who tested positive for the virus, the highest number of fatalities in Europe.
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The five pillars of Islam
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UAE currency: the story behind the money in your pockets
MATCH INFO
FA Cup fifth round
Chelsea v Manchester United, Monday, 11.30pm (UAE), BeIN Sports
Veil (Object Lessons)
Rafia Zakaria
Bloomsbury Academic
The five pillars of Islam
Specs
Engine: Duel electric motors
Power: 659hp
Torque: 1075Nm
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Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.