The World Health Organization (WHO) is running out of funds to fight Ebola in West Africa just as the three hardest hit countries begin to make progress against the virus.

The assistant director-general in charge of the Ebola response, Bruce Aylward, said Friday that the WHO will no longer have money to support efforts to fight the virus by mid-February.

{mosads}”That is four or five months before that virus is going to stop in a best case scenario,” Aylward said at a media briefing, according to Reuters.

New Ebola cases have declined for the past month in Guinea, Liberia and Sierra Leone, signaling that the outbreak may officially be in decline there.

At the same time, West Africa’s rainy season in April and May could accelerate the virus’s spread.

The WHO wants to spend $350 million on Ebola over the next six months, Reuters reported, but lacks $260 million of that amount.

“If you go into wet season with this disease you are looking at another hard year,” Aylward said.

Ebola has been a major topic at the World Economic Forum in Davos, Switzerland, as world leaders gather to discuss global security issues.

Alpha Conde, the president of Guinea, called on medical officials to develop a new “early-warning system” for diseases like Ebola.

“We need to be able to detect all these different viruses ourselves, and not always rely on aid from the outside,” Conde told the International Business Times. “Now it’s Ebola, but it could be any kind of disease or a new disease.”