Discovery of a Northern California coronavirus patient believed to be the first U.S. case from an unknown, community-spread source is an alarming twist that means it could be time to practice "social distancing," experts say.
The U.S. has confirmed 60 patients, but this one is alarming because no exposure chain has been found. The Centers for Disease Control and Prevention says it remains possible that the female patient at UC Davis Medical Center was somehow exposed to a returned traveler who was infected in China. But investigators have been unable to find that connection.
The alternative is "community spread," meaning the source of infection is unknown, CDC said.
https://www.usatoday.com/story/news/nation/2020/02/27/coronavirus-update-cdc-test-covid-community-spread-case/4889999002/
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