Sept. 14 (UPI) -- The World Health Organization announced Sunday that a vaccination campaign for frontline workers and people infected with Ebola has begun in the Democratic Republic of Congo. An initial 400 doses of the Ervebo Ebola vaccine from the country's 2,000 stockpile have been delivered to Bulape in the DRC's central province of Kasai, that borders Angola, where officials are attempting to clamp down on an outbreak of the deadly and contagious Ebola virus, the WHO said in a statement .