London — Trial successes from Pfizer and Moderna have buoyed hopes that a Covid-19 vaccine is coming soon. But much of the world, beyond rich nations such as the US, is counting on another company’s shot to escape the crisis.

Findings from the final stage of AstraZeneca’s vaccine studies are due to be released shortly, and the stakes for lower- and middle-income nations are immense. The shot developed with the University of Oxford accounts for more than 40% of the supplies going to those countries, based on deals tracked by London-based research firm Airfinity...

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