▁Kor ok para , ▁registered ▁the ▁fifth ▁fatal ity ▁due ▁to ▁the ▁E bol a ▁virus ▁disease ▁in ▁Guinea . ▁On ▁ 2 9 ▁March ▁it ▁was ▁reported ▁that ▁about ▁ 1 0 0 0 ▁contacts ▁had ▁been ▁identified ▁( 1 4 2 ▁as ▁high ▁risk ), ▁and ▁on ▁ 3 0 ▁March , ▁ 3 ▁more ▁confirmed ▁cases ▁were ▁reported ▁from ▁the ▁sub - p ref ect ure ▁of ▁Kor op ara ▁in ▁Guinea . ▁On ▁ 1 ▁April ▁it ▁was ▁reported ▁that ▁possible ▁contacts , ▁which ▁number ▁in ▁the ▁hundreds , ▁had ▁been ▁v acc in ated ▁with ▁an ▁experimental ▁v acc ine , ▁in ▁a ▁" ring ▁v acc ination " ▁approach . ▁ ▁On ▁ 5 ▁April ▁it ▁was ▁reported ▁that ▁there ▁were ▁nine ▁new ▁cases ▁of ▁E bol a ▁since ▁the ▁virus ▁res ur fac ed . ▁Of ▁these ▁nine ▁cases ▁eight ▁have ▁died . ▁After ▁a ▁ 4 2 - day ▁waiting ▁period , ▁the ▁W HO ▁declared ▁the ▁country ▁free ▁of ▁E bol a ▁on ▁ 1 ▁June . ▁ ▁V acc ines ▁ ▁After ▁a ▁trial ▁run ▁of ▁an ▁experimental ▁E bol a ▁v acc ine ▁involving ▁ 1 1 , 0 0 0 ▁people ▁in ▁Guinea , ▁Mer ck , ▁the ▁v acc ine ’ s ▁manufact urer , ▁announced ▁it ▁was ▁found ▁to ▁be ▁“ high ly ▁protect ive ” ▁against ▁the ▁virus . ▁This ▁confirmed ▁the ▁results ▁of ▁a ▁study ▁published ▁in ▁ 2 0 1 5 ▁that ▁awarded ▁the ▁v acc