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The Ebola outbreak in coastal West Africa is still contained to Guinea and Liberia, the World Health Organization announced Tuesday, despite rumors of the virus spreading to other countries, CNN reported.

Cases have been reported in Sierra Leone, Mali and Ghana, but the WHO says none has been confirmed. Rumored cases in Mali are still being investigated.

The number of suspected cases in Guinea has grown to 157, with 101 deaths. Sixty-seven have been confirmed as Ebola. In Liberia, 21 cases have been reported, including 10 deaths. Five of the cases have been confirmed as Ebola.

The outbreak has "rapidly evolved" since originating in the forests of southeastern Guinea. The city of Guekedou, near the borders with Sierra Leone and Liberia, has seen the majority of the deaths.

Twenty cases are believed to have occurred in Guinea's capital, Conakry, according to WHO.

"This is one of the most challenging Ebola outbreaks that we have ever faced," said Dr. Keiji Fukuda, WHO's assistant director-general for health security.

It's the first emergence of Ebola in western Africa, which means doctors and health officials in the region don't have any experience with the virus. Outbreaks generate a lot of fear and anxiety, Fukuda said, which can lead to misinformation.