On January 19, a 35-year-old man walked into an urgent care center in Snohomish County, Washington, with a cough and a fever. Four days earlier, he had returned from a trip to Wuhan, China. But he was almost certainly not the true first. Since then, a growing number of puzzle pieces have revealed a different picture of the beginning of the country's outbreak.
Get answers to general questions for COVID19 plus links to other frequently asked questions by government agencies on this page.