An Ebola outbreak in northeastern Democratic Republic of Congo linked to 80 deaths and hundreds of suspected infections has spread across the border to Uganda, triggering concern that it will be even more difficult to contain.

Democratic Republic of Congo Health Minister Samuel Roger Kamba Mulamba said in a statement late Friday that samples tested on Thursday had confirmed eight cases of the Bundibugyo strain of the Ebola virus in the health zones of Rwampara, Mongwalu and Bunia.

So far there have been 246 suspected cases of the ?virus, the ministry said. The suspected index case was a nurse who died at the Evangelical Medical Center in Bunia after showing symptoms that ?included ?fever, bleeding, vomiting and severe weakness.