Despite intensive investigations extending over several years, research has failed to find an animal reservoir of the virus or determine where it hides in nature between outbreaks.

尽管延续几年的强化调查，但是研究未能发现该病毒的动物储主或确定两次暴发之间它隐藏在自然界的何处。

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Doubts persist on the natural history of the virus and further studies are needed to identify the exact reservoir of the monkeypox virus and how it is maintained in nature.

对该病毒的自然史仍存有疑问，需要进一步继续研究，以确定猴痘病毒的确切贮主，以及该病毒在自然界是如何生存下来的。

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The natural reservoir of the Ebola virus seems to reside in the rain forests of the African continent and in areas of the Western Pacific.

埃博拉病毒的自然宿主似乎居于非洲大陆的雨林以及西太平洋地区。

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"The best way to either eliminate the virus or allow the immune system to suppress residual virus is to treat someone as early as possible after infection so as not to allow a substantial reservoir of the virus to take hold, " Fauci told CNN.

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Extensive ecological studies are underway in three African countries, including DR Congo, to try to find the "reservoir" - this work essentially involves checking for signs of the virus in thousands of different species of animal, in order to identify the carrier.

BBC: Africa's emerging virus threat