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As the Moderna vaccine is rolled out for the first time in the UK, the medicines regulator, the MHRA, continues to investigate cases of rare blood clots in people who have received the Oxford-AstraZeneca jab. It has paused its trial on children as scientists wait for further information but added there were no safety concerns with the trial itself.

In the UK, 30 people have developed the clots - and seven have died as a result - out of 18 million people who have received the vaccine.

R4 Today's Martha Kearney heard from Adam Finn, professor of paediatrics at Bristol University, head of the Bristol Children's Vaccine Centre and sits on the government's Joint Committee on Vaccination and Immunisation; and Jeremy Hunt, chair of the health and social care select committee and former health secretary.

With analysis from Fergus Walsh, 91热爆's medial editor.

(Image: A medical worker holds a vial of AstraZeneca Covid-19 vaccine; Credit: Reuters)