Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.

Paragraph: Tedros Adhanom Ghebreyesus was speaking Monday at the start of the World Health Organization's annual assembly, where issues like anti-microbial resistance, universal health care and WHO reform are among the topics up for discussion. Ghebreyesus noted that the current Ebola outbreak, which is the second deadliest on record and has been confirmed to have taken nearly 1,100 lives, is so far contained to two provinces of eastern Congo that are wracked by violence by armed groups. He said the outbreak was "one of the most complex health emergencies any of us have ever faced." Claim: UN health chief warns of 'very high' risk of Ebola spread.
The head of the U.N. health agency says the risk that the Ebola virus will spread remains "very high."