The World Health Organization warned Thursday that security incidents continue to "severely impede" public health activities working to contain the deadly Ebola outbreak in the Democratic Republic of the Congo, where transmission is "intense" in some communities in the city of Beni.

Why it matters: Recent violence has halted education and vaccination campaigns several times, jeopardizing strides made in containing the outbreak, such as tracking contacts of infected people, educating wary community members and administering vaccinations.