Lack of contact tracing after White House event raises public health concerns

The World

A number of people who attended the White House announcement of President Donald Trump’s Supreme Court nominee have since tested positive for COVID-19. But the administration has not been transparent about what contact tracing efforts, if any, it has made to investigate the event. Susie Welty, a global health expert at the University of California San Francisco, discusses how contact tracing works and why it’s an essential tool to help combat the spread of COVID-19.

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