A patient at Mount Sinai Hospital was under treatment Monday afternoon, after being tested after traveling to a country where the Ebola virus is present, the hospital said in a statement. The man arrived at the East Harlem medical center’s emergency room early Monday morning with high fever and gastrointestinal symptoms. The man told doctors he had recently traveled to a West African country where Ebola has been reported, the hospital said. The man has been placed in “strict isolation” and is undergoing various tests to determine the cause of the symptoms, the hospital said.