For Dr. Stuart Seides, director of the MedStar Heart & Vascular Institute, the first sign of trouble surfaced early Monday when he checked his email as he prepared to leave for the hospital. "I noticed that I didn't have any emails since the previous evening," Seides told U.S. News Tuesday as the hospital system's computer crisis stretched into its second day. "I get lots of emails every day... That was the first indication that something wasn't quite right." The problem was a computer virus that shut down the data network of the second largest health system in Maryland, with 30,000 employees, 6,000 affiliated physicians and nearly 50,000 annual admissions at two major hospitals – the nearly 800-bed MedStar Washington Hospital Center and 400-bed MedStar Georgetown University Hospital – and thousands of outpatients at other facilities.