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Three challenges emerge as coronavirus vaccine inoculations begin

Visual data: cold storage, duration of preventive effect and safety

TOKYO -- Vaccines are one of the keys to controlling the spread of the new coronavirus. Many versions are now in the final trial stages, while a Pfizer-BioNTech vaccine has started to be rolled out in the U.K. Nikkei looks at the other vaccines still under development around the world, as well as challenges scientists still face. The visual data here illustrate those points.

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