Update: Johnson & Johnson delays vaccine rollout in Europe - a podcast by BBC World Service

Johnson & Johnson has decided to delay the rollout of its vaccine in Europe after authorities in the US raised fears over a possible link to blood clots. We speak to Krishna Udayakumar, a professor of medicine and director of the Duke Global Health Innovation Center in North Carolina. And we hear how US markets reacted to the news from Joe Saluzzi of Themis Trading in New Jersey.

Plus, as drone racing is becoming increasingly popular, we speak to Nicholas Horbaczewski, founder of the professional Drone Racing League.

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