A WHO official tells CBS News Ebola is still spreading in Congo after a month, as experts race to contain the outbreak in Central Africa.

Since the outbreak was declared on May 15, there have been 676 confirmed Ebola cases, including 136 deaths in the DRC, according to the WHO

The country's health ministry said that spike also reflects more active surveillance

Nearly a million people have been displaced by years of conflict in the region, complicating efforts to contain the outbreak.

(Bloomberg) -- Ebola treatment centers in eastern Democratic Republic of Congo are becoming overwhelmed as confirmed cases surge past 800 and health workers struggle to track…

Two additional health zones in Congo are now affected, authorities say.

A WHO official tells CBS News Ebola is still spreading in Congo after a month, as experts race to contain the outbreak in Central Africa.

Efforts to stop Central Africa's deadly Ebola outbreak face widespread mistrust and porous borders in a war zone.

"The outbreak remains serious" and is "evolving so fast", said Marie-Roseline Belizaire, the WHO Africa emergencies chief.