article_snippet: (CNN)Two more American aid workers who had high-risk exposure to Ebola in Sierra Leone arrived back in the United States on Monday for monitoring.
article_snippet: Eight of their colleagues have already been flown back to the United States, where health authorities are watching health authorities closely for signs of the disease, according to the Centers for Disease Control and Prevention.
article_snippet: The returning workers are clinicians for Partners in Health, a Boston-based aid group.
article_snippet: While in West Africa, the workers "came to the aid of the workers ailing colleague," according to a Partners in Health statement.
article_snippet: As the CDC investigates who else might have had contact with the patient, more workers might be flown back to the United States, according to Tom Skinner, a spokesman for the CDC.
article_snippet: The next set of aid workers returned back to the United States on Saturday evening and went into isolation in housing on the campus of the University of Nebraska Medical Center, according to spokesman Taylor Wilson.
highlights_snippet: Eight aid workers have already returned, and two more are back Monday .