Citing concerns about privacy and civil liberties, the city's not relying on a smartphone app to track cases. Instead, it's recruiting public health staff, librarians and med students to make calls.
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Eric Westervelt is a San Francisco-based correspondent for NPR's National Desk. He has reported on major events for the network from wars and revolutions in the Middle East and North Africa to historic wildfires and terrorist attacks in the U.S.