Craig Spencer, a 33-year-old doctor, is the first person found to have Ebola in New York City. Since Spencer was rushed to Manhattan's Bellevue Hospital on Thursday, immediately after showing symptoms, health officials have been retracing his steps and working to identify anyone the patient may have come into contact with since returning to the United States from Guinea on Oct. 17. As a member of Doctors Without Borders, Spencer had been treating Ebola patients in Guinea, one of the three West African countries hit hardest by the Ebola epidemic. At a news conference on Thursday night, Mayor Bill de...