Washington, May 19 -- An international effort is underway to contain an Ebola outbreak in the Democratic Republic of Congo (DRC) and Uganda that has infected hundreds of people and caused dozens of suspected deaths, with the United States triggering a public health law to limit entry from the affected region.

An American working in the DRC tested positive for Ebola, the US Centers for Disease Control and Prevention (CDC) confirmed Monday. Authorities did not name the person.

Earlier in the day, the international charity Serge reported that a Christian missionary physician - Dr. Peter Stafford - had "tested positive" after "presenting symptoms consistent with the virus."Serge, an international Christian missions organisation, confirmed Mon...