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The ‘last mile’ for COVID-19 vaccines could be the biggest challenge yet

A race to develop a COVID-19 vaccine began almost the minute the coronavirus’s genetic makeup was revealed in January. Already, two companies have announced that their vaccines appear safe and about 95% effective (SN: 11/18/20, SN: 11/16/20). Government regulators in the United Kingdom granted permission December 2 for emergency use of a vaccine made by the […]

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