1: ( 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 . 2: Eight of their colleagues have already been flown back to the United States , where health authorities are watching them closely for signs of the disease , according to the Centers for Disease Control and Prevention . 3: Eight aid workers have already returned , and two more are back Monday .
1: Two more American aid workers who had high-risk exposure to Ebola in Sierra Leone 2: their 3: two more