An undisclosed number of people who’ve been exposed to the Ebola virus — not just the four patients publicly identified with diagnosed cases — have been evacuated to the U.S. by an air ambulance company contracted by the State Department. “We moved a lot of other people who had an exposure event,” said Dent Thompson, vice president of Phoenix Air Group. “Many times these people are just fine, they just had an exposure. But you have to treat it as though the disease is present.” How many exposed patients have been flown from West Africa to the U.S.? Thompson said...