Global health experts came under increasing pressure on Tuesday to clear up questions over the safety of AstraZeneca's Covid-19 shot, as Sweden and Latvia joined countries suspending their use in a further blow to Europe's vaccination rollout.

The European Medicines Agency (EMA) said it was investigating reports of 30 cases of unusual blood disorders out of five million recipients of the AstraZeneca vaccine. In total, 45 million Covid shots have been delivered across the region...