San Francisco/Tokyo/Seoul/Singapore — AstraZeneca said it has paused global trials, including large late-stage trials, of its experimental coronavirus vaccine due to an unexplained illness in a study participant.

The vaccine, developed with the University of Oxford, has been described by the World Health Organisation (WHO) as probably the world’s leading candidate and the most advanced in terms of development. The suspension dims prospects for an early rollout amid reports that the US was aiming for a fast-track approval before the November presidential election...

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