The U.K.'s vaccines advisory body said Wednesday that a Covid-19 vaccine developed by AstraZeneca PLC shouldn't preferably be given to patients aged under 30 following concerns that it may cause potentially deadly blood clots in very rare instances.

Britain's Medicines and Healthcare Products Regulatory Agency said more work is needed to firm up the link between the vaccine and blood clots.

The AstraZeneca shot has faced questions about its efficacy and potential side effects even as tens of millions of doses have been administered following safety signoffs in more than 70 countries.

The British government said last week that 79 severe blood-clotting cases were reported in the U.K. out of 20 million administered doses of the Oxford-AstraZeneca vaccine, according to data as of March 21. 19 of the people died, the regulator has told reporters.

Britain is planning to give all adults a vaccine shot by the end of July. Health regulators now recommend that under 30s receive shots developed by Pfizer Inc. and BioNTech SE, Moderna Inc.

 

Write to Max Colchester at Max.Colchester@wsj.com

 

(END) Dow Jones Newswires

April 07, 2021 11:10 ET (15:10 GMT)

Copyright (c) 2021 Dow Jones & Company, Inc.
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