FILE - Colorized scanning electron micrograph of a single filamentous Ebola virus particle. PORTLAND, Ore. - Four people are being monitored by Oregon public health officials after potentially being exposed to Ebola while on a recent visit to Guinea and the Democratic Republic of the Congo (DRC), according to an Oregon Health Authority news release.The West African countries are currently experiencing an Ebola outbreak, but health officials believe the four people who recently returned to the United States are considered low risk."We want to make sure these individuals have the support they need to monitor their health, stay in contact with public health officials and safely get help with medical services if it comes to that," said Dr..