The World Health Organization's Africa regional director is urging the global community not to underestimate the Ebola outbreak in the Democratic Republic of Congo, warning it carries a serious cross-border transmission risk.

The DRC health ministry reported 670 suspected cases, 160 suspected deaths and 61 confirmed infections as of Thursday.

Two confirmed cases have already crossed into neighboring Uganda, Reuters reported Friday.

"It would be a big mistake to underestimate it," WHO Africa regional director Mohamed Yakub Janabi told Reuters.

"You just need one contact case to put all of us at risk." No Vaccine, No Index Case Ebola, or Ebola virus disease, is a zoonotic viral hemorrhagic fever with a two-to-three-week incubation period.