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Emerging Coronavirus Variants May Pose Challenges to Vaccines

The steady drumbeat of reports about new variants of the coronavirus — first in Britain, then in South Africa, Brazil and the United States — has brought a new worry: Will vaccines protect against these altered versions of the virus?

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OVERVIEW: International COVID-19 developments

(Reuters) - Britain saw record-high COVID-19 deaths and Spain posted its biggest one-day jump in cases since October, while the head of the World Health Organization said there was a “clear problem” of low- and middle-income countries not yet receiving vaccine supplies.

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