The Moderna vaccine will be administered in England from mid-April, said Deputy Chief Medical Officer for England, Professor Jonathan Van-Tam.
Commenting on the briefing, he said, “We expect to see quantities of Moderna deployed in England from mid-April.
“The UK has placed orders with Janssen. We are not yet sure of the timing of delivery, but this vaccine may be available in the summer.”
Boris Johnson thanked the experts for their work on the AstraZeneca vaccine and for explaining the “potential for extremely rare side effects”.
The Prime Minister said: “As regulators have said, this vaccine is safe, effective and has already saved thousands of lives – and the vast majority of people should keep taking it when it is offered.
“We will follow today’s updated advice to enable people of all ages to continue to have full confidence in vaccines to save lives and carefully return to normal.”
The chairman of the Committee for Medicinal Products for Human Use, Sir Munir Pirmohamed, said experts currently “have no evidence that men or women are more likely to be affected by the rare side effect”.
When asked if women might be at higher risk than men, he said at a press conference: “Of the 79 cases, 51 were women and 28 men.
“The numbers are quite small and that might actually reflect who is receiving the vaccine, given that many of the healthcare workers, for example, are women.
“But when you actually look at the incidence rate by the number of vaccines given, there is actually no difference between men and women.”
Sir Munir said experts would continue to monitor any gender preference for the development of this side effect, adding, “However, at the moment we have no evidence that either men or women are more likely to get this.”