回答: 截止5月21日13时，世卫组织公布重大发现，疫情源头或将真相大白 由 牛员外 于 2020-05-21 6:36

hinese city of Wuhan may not be where it began, a scientist looking at the origins of the disease has said. 6park.com
Geneticist Peter Forster, from the U.K.'s University of Cambridge, is leading a research project to understand the historical processes that led to the COVID-19 pandemic. Ultimately, they hope to identify the first person who got the virus and served as the source for the initial outbreak. By analyzing networks, they have so far been able to chart the spread of the virus, including the genetic mutations, as it moved from China to Australia, Europe and the rest of the world. 6park.com
They have created a network analysis using over 1,000 coronavirus genomes. This includes patient infection date and the "type" of virus the person was infected with. There are three types—A, B and C. A is closest to the coronavirus found in bats and is thought to be the original human virus genome. This type was found in Chinese and American individuals, with mutated versions in patients from Australia and the U.S. 6park.com
However, A was not the virus type found in most cases in Wuhan, the city in China where COVID-19 was first identified. Instead, most people there had type B. Researchers suggest there was a "founder event" for type B in Wuhan. Type C, the "daughter" of type B, is what was identified in early cases in Europe, as well as South Korea, Singapore and Hong Kong—but appears absent from mainland China.