| When meatpacking workers in Postville, Iowa, got sick with covid-19, the plant didn't shut down. The state didn't conduct an inspection. Officials wouldn't even disclose how many people had fallen ill. But the truth was written in the coronavirus's genetic code. A local scientist-turned-disease detective used genetic analysis to reveal the scale of the outbreak, which began in Postville and spread to 15 cities across three states. | 
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