RABAT, Morocco (AP) — The Ebola outbreak in three West African countries is already the deadliest to date with 635 cases and 367 fatalities, and is expected to be the longest on record, as some of the poorest countries in the world scramble to confront the fatal disease.

The World Health Organization says there is an “urgent need” to coordinate the response across the borders and is convening a meeting in Accra, Ghana on July 1 with the three countries involved as well as other nations that experienced outbreaks in the past.