The San Francisco Gate reports that researchers at Stanford Medicine tested 3,200 people at three Bay Area locations to see if some Californians already had COVID-19. The new study looks for antibodies and results are expected in the coming weeks. The data could help to prove COVID-19 arrived undetected in California much earlier.
"During that same time, California was welcoming as many as 8,000 Chinese nationals daily into our airports. Some of those visitors even arriving on direct flights from Wuhan, the epicenter of the coronavirus outbreak in China."
https://www.sfgate.com/bayarea/article/Study-investigates-if-COVID-19-came-to-Calif-in-15187085.php
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