(CNN) Doctors have shared new details about the first case of Wuhan coronavirus in the United States in a paper published Friday in the New England Journal of Medicine. In the new report, doctors describe how the man progressed from initially mild, nonspecific symptoms to pneumonia on the ninth day of his illness. The patient -- a 35-year-old resident of Snohomish County, Washington, with no history of major health problems -- had returned from visiting family in Wuhan on January 15. Doctors initially found nothing abnormal on chest X-rays, but sent swabs to the CDC because of his recent travel to Wuhan. By the following day, on January 20, they confirmed the man had the novel coronavirus.

Source: CNN January 31, 2020 22:41 UTC