U.K. Limits AstraZeneca Covid-19 Vaccine to Over-30s Amid Blood-Clot Concerns

The U.K.’s vaccines advisory body said Wednesday that AstraZeneca PLC’s Covid-19 shot should preferably not be given to patients under 30 following concerns that it might 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.

Jonathan Van-Tam, Britain’s deputy chief medical officer, said the pace of Britain’s vaccine rollout shouldn’t be affected by the decision provided currently expected supplies were delivered. The government has said it plans...