(CNN) - Tougher screening measures are being considered to prevent the spread of Ebola in the U.S. Federal officials say all options are on the table. But Dr. Thomas Frieden, the director of the Centers for Disease Control, says there would have to be measures that really benefit the American people and not something just for show. Frieden also said there will remain a risk to the United States. "The bottom line is that as long as this is spreading in Africa, whatever we do, there will be some risk here. We can't get that risk to zero until we have it controlled in West Africa. So we have to make sure that whatever we do doesn't undermine the efforts there," Frieden said.
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