Merck said Monday it will stop developing both of the current formulations of the Covid-19 vaccines the company was working on, citing inadequate immune responses to the shots.
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?
LONDON — British front-line workers who were applauded on doorsteps in the early weeks of the pandemic now confront a torrent of polarization and misinformation.
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