The individual, whose name was not released for privacy reasons, did not develop Ebola symptoms during 21 days of monitoring at Nebraska Medical Center in Omaha, Nebraska, the center said in a statement.
Ebola still kills most of the people who contract it. Since the outbreak here was declared in August, health officials have recorded 583 confirmed and suspected cases as of Dec. 25. About a third of the patients have recovered, while 354 have died.
As the need for help in containing the outbreak grows, two of the world's most prominent medical journals this week published statements by global health experts urging the Trump administration to do more.
Health workers have already administered therapeutic treatments to more than 150 Ebola patients since August in an effort to contain the worst of Democratic Republic of Congo's 10 outbreaks of the hemorrhagic fever since 1976.
Ebola spreads through contact with the bodily fluids of its victims. The health ministry said 73 patients had received new experimental treatments. Of them, just over half recovered, 20 were still in hospital and the rest died.
In the Top frames this week The Nobel Peace Prize 2014 was awarded jointly to Kailash Satyarthi and Malala Yousafzai "for their struggle against the suppression of children and young people and for the right of all children to education".