GENEVA, May 22 (Xinhua) -- The public health risk from the Ebola outbreak in the Democratic Republic of Congo has been upgraded from high to very high, the World Health Organization(WHO) said on Friday.

"We are revising our risk assessment of Ebola to very high at the national level, high at the regional level, and low at global level" WHO chief Tedros Adhanom Ghebreyesus told a press conference. ■