The World Health Organization reported Friday 44 new cases of Ebola in West Africa and 21 more deaths between July 6 and July 8.

The total in the worst outbreak of the deadly virus now stands at 888 cases, including 539 deaths since February, according to Reuters.

“The epidemic trend in Liberia and Sierra Leone remains precarious with high numbers of new cases and deaths being reported,” the WHO said, Reuters reported.

Ebola causes vomiting and diarrhea, impairs kidney and liver function and may cause internal and external bleeding. It kills up to 90 percent of those infected and is spread by close contact with the blood, body fluids and tissues of infected people. There is no treatment or vaccine.