U.K. Under-40s to Get Alternative Covid Vaccine to Astra (1)

The U.K. will offer under-40s an alternative to the AstraZeneca Plc Covid-19 vaccine because of concerns about very rare blood clots that so far appear to be more common in younger people.

The decision, announced Friday, follows a recommendation by U.K. scientific advisory panel the Joint Committee on Vaccination and Immunisation. The precautionary measure comes as authorities prepare to open up the inoculation program to people under 40, after those over 40 were invited to book their first shots in the last week.

The Astra vaccine, created with the University of Oxford, has been the workhorse of the U.K. program ...