Governments and drugmakers are weighing how to roll out coronavirus vaccines, including reserving the first batches for health-care workers, as several shots race to early leads.

Of more than 100 vaccines in development globally, at least eight have started testing in humans, including candidates from Moderna Inc. and Pfizer Inc. At the same time, pharmaceutical giants like Johnson & Johnson, AstraZeneca PLC and Sanofi SA are building capacity to make hundreds of millions of doses of their own or their partners’ vaccines….

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