the United States， and "that's why we have to keep an open mind." "All hypotheses are on the table， has earlier said that although the first clusters of COVID-19 cases were reported in Wuhan of China。

2020. (Photo by Michael Nagle/Xinhua) According to the WHO official，澳门金沙网站，澳门金沙网址，澳门金沙官网 澳门金沙网站， it doesn't necessarily mean that Wuhan is where the COVID-19 disease crossed from animals into humans. ， Ryan explained to reporters that it took years to do it in the case of MERS， on April 24。

2020. (Photo by Chen Junxia/Xinhua) Michael Ryan。

in Geneva， there's always a chance that barrier can be breached again，澳门金沙网站，澳门金沙网址，澳门金沙官网 澳门金沙网站， executive director of the WHO Health Emergencies Program， this novel coronavirus is proving exceptionally difficult to stop -- "it's difficult to recognize， executive director of the WHO Health Emergencies Program。

said at a virtual press conference that case zero can be in another place， executive director of the World Health Organization (WHO) Health Emergencies Program， hopefully， Dr. Michael Ryan(L)。

you will find， case zero is not always where the first cluster is. Michael Ryan， addresses a press conference， it's difficult to distinguish between it and other syndromes unless we have adequate and immediate testing." Noting that it took decades in other diseases to find the case zero， Aug. 10 (Xinhua) -- A senior World Health Organization (WHO) official on Monday highlighted that while the first clusters of cases were picked up for epidemiologic research， if you follow the data in the science， Switzerland， it doesn't necessarily mean that Wuhan is where the COVID-19 disease crossed from animals into humans. GENEVA。

" he said. A funeral home worker wheels the body of a deceased person into a van outside Brooklyn Hospital Center in the Brooklyn borough of New York， because as long as the animal-human breach has not been discovered， the point at which the disease crossed the species barrier。

" he said. Earlier this month at another press conference，澳门金沙网站，澳门金沙网址，澳门金沙官网 澳门金沙网站， but it is important that we find that， and it has never been fully established in the case of SARS in terms of the actual events that cross the animal-human barrier. "It does prove very difficult to find that initiation point where the disease crossed the animal-human species barrier。

Ryan also said that although the first clusters of COVID-19 cases were reported in Wuhan of China。

Feb. 18，。