The one shot jab will mainly be used to target young adults who might not want to wait three months for a second dose, The Telegraph reports. Those who received the Oxford-AstraZeneca vaccine have had to get two jabs, approximately 12 weeks apart, before being fully protected against the virus.
But ministers are hoping the Janssen vaccine, made by Johnson & Johnson, will attract young people who might be eager to enjoy the summer when pubs and restaurants begin to reopen.
The vaccines minister Nadhim Zahawi said that UK medical regulators are formally assessing the safety of the Janssen jab.
Downing Street sources have said the first Janssen vaccines will be given to people by July at the earliest.
The Government has ordered 30 million doses of the Johnson and Johnson jab.
One source told the Telegraph: “Where it will be useful is it could work really well for the younger cohort – the 18 to 29 year olds.
“One hit and you are done – and you are off to Ibiza.”
Last week, Mr Zahawi told MPs in the Commons: “Reviews are underway by the Medicines and Healthcare products Regulatory Agency (MHRA) to assess the Johnson & Johnson (known as Janssen in Europe) and Novavax vaccines.
“Any vaccines that are made available will have been authorised because they pass the MHRA’s tests on safety and efficacy.
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On Saturday, official figures showed that the UK has recoded 3,423 new COVID-19 cases.
A further 10 deaths were also reported in the latest 24-hour period.
In England, adults aged 50-54 are being urged to get their first dose in the next few days.
People under 50 without underlying medical conditions in England may have to wait until May for their first vaccine shot.