As Americans anxiously watch the spread of coronavirus variants that were first identified in Britain and South Africa, scientists are finding a number of new variants that seem to have originated in the United States — and many of them may pose the same kind of extra-contagious threat.
In a study posted on Sunday, a team of researchers reported seven growing lineages of the coronavirus, spotted in states across the country. All have gained a mutation at the exact same spot in their genes.
Two months after the first COVID-19 shots were administered, the race to vaccinate older Americans is gaining traction, with more than a third of people 65 and up having received their first dose in states that have provided data.
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