Parts of the U.S. are further easing lockdowns this week and the World Health Organization will hold its annual health assembly online, as drugmakers race to develop a vaccine for the new coronavirus.

As the number of cases exceeded 4.7 million globally, according to data compiled by Johns Hopkins University, governments and drugmakers are considering how to roll out vaccines, with the first batches reserved for front-line medical workers. About 100 vaccines are being developed globally, and eight of those—from companies…

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