UNITED NATIONS (AP) — The U.N.’s Ebola chief says there are still at least 50 hotspots in the hardest-hit West African countries but new cases are declining in Guinea, Liberia and Sierra Leone and the deadly disease will be defeated.

Dr. David Nabarro said Thursday the latest report from the World Health Organization was “very good news.”

In the week ending Jan. 11, WHO said Guinea reported its lowest weekly total of new Ebola cases since mid-August, Liberia had its lowest total since the first week of June, and new cases in Sierra Leone declined for a second week to the lowest level since the end of August.

Nabarro cautioned, however, that there are still “numbers of new cases that are alarming.”