In this photo taken Jan. 23, 2020, Dr. George Diaz, section chief for infectious diseases at Providence Regional Medical Center, poses for a photo in Everett, Wash. Diaz was part of the team that treated the first U.S. patient infected with the new virus from China, who was admitted to the facility on Jan. 20, 2020. The hospital released a statement Monday, Feb. 3, 2020, from the unidentified 35-year-old man that said he has left the hospital and is now in isolation at home, and will be monitored by officials with the Snohomish Health District in coordination with the hospital. (AP Photo/Ted S. Warren)