The New York Times, January 19, 2021
In late December, scientists in California began searching coronavirus samples for a fast-spreading new variant that had just been identified in Britain.
They found it, though in relatively few samples. But in the process, the scientists made another unwelcome discovery: California had produced a variant of its own.
That mutant, which belongs to a lineage known as CAL.20C, seemed to have popped up in July but lay low till November. Then it began to quickly spread.
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