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Welcome to the sprint known as contact tracing, the process of reaching potentially exposed people as fast as possible and persuading them to quarantine. The race is key to controlling the pandemic ahead of a vaccine, experts say. But most places across the United States aren’t making public how fast or well they’re running it, leaving Americans in the dark about how their governments are mitigating the risk. An exception is the District of Columbia, which recently added metrics on contact tracing to its online dashboard . A few weeks ago, the District was still too overwhelmed to try to ask all of those who tested positive about their contacts. Now, after building a staff of several hund... Full story

5 July