It happened in Chicago, but it did not start or stop there. A 60-something-year-old woman from the Windy City traveled halfway around the world to Wuhan, China, this past December. Her husband stayed in Illinois. She came home on Jan. 13 -- and brought something with her. She gave it to her husband. "The individual did not have symptoms while traveling," Dr. Jennifer Layden, chief medical officer for the Illinois Department of Public Health, explained during a Jan. 24 press briefing sponsored by the federal Centers for Disease Control and Prevention. But that, of course, was not the end of...