A surgeon diagnosed with Ebola in Sierra Leone is in an “extremely critical condition,” doctors treating him in Nebraska said early Sunday. Dr. Martin Salia arrived in the U.S. Saturday to be treated at the Nebraska Medical Center in Omaha. Salia -- the 10th Ebola patient to be treated on American soil -- was taken off the plane on stretcher and was then loaded onto a gurney encased in a plastic bubble and placed on an ambulance by workers who wore yellow protective suits. Hospital spokesman, Taylor Wilson, said Salia is "extremely ill," possibly more sick than any patient yet transported from West Africa to the U.S. for treatment.