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.
In March, Marc Price set up a tent outside his primary care practice in Malta, N.Y., where he and his colleagues could don their protective gear to see the daily stream of coronavirus patients. Three weeks ago, the tent was finally upgraded to a shed ahead of snowstorms. But, despite months of constant close contact with Covid-19 patients, staff at the practice have yet to be vaccinated.
JACKSON, Miss. — Four days before Christmas, Chiquikta Fountain watched as a growing line of cars stretched down a mile of road in the Mississippi Delta.
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