There are now four presumptive cases of the coronavirus with no known origin in the United States — one in Oregon, one in Washington state, and two in Northern California — and the Centers for Disease Control said in a state Friday that "unprecedented efforts have been taken to contain the spread."
The patients tested positive locally, though they are still awaiting confirmation from the CDC. Most of the 67 confirmed cases in the United States so far have been traced to travel to Asia (the disease originated in Wuhan, China), but the four cases mentioned have occurred without any related travel history. Instead they're being labeled as "community spread" cases, though the extent is unclear.
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