Efforts to contain the Ebola outbreaks in Nigeria and Senegal appear to have succeeded, even as the virus continues to spread in the hardest-hit West African countries of Guinea, Liberia and Sierra Leone, U.S. and African health officials said on Tuesday.

In Senegal, healthcare workers have contained Ebola after a single case was confirmed on August 29 .

When the case was discovered in Africa's largest city, Nigeria declared an Ebola emergency and quickly established a National Ebola Emergency Operations Center that helped streamline and coordinate the tracing of contacts of Ebola patients.

All were monitored for Ebola for 21 days with no further Ebola cases.

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