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.

Additional doses of the vaccine will be delivered in the coming days, it said.

The vaccine doses are being distributed under what the WHO called a "ring" strategy that first vaccinates individuals at highest risk after coming into contact with a confirmed patient.

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