London — Vaccinations of children in a study of the Covid-19 shot developed by AstraZeneca  and the University of Oxford have been paused while the UK’s drug regulator investigates rare cases of blood clots in adults.

The vaccine researchers are awaiting the results of a review by the Medicines and Healthcare Products Regulatory Agency, the UK’s drug watchdog, “before further vaccinations”, the university said in an e-mailed statement. No safety issues have arisen in the children’s trial, Oxford said...

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