Cambridge University published a paper on 09/04/2020, thinking that the new coronavirus type A is the root cause of the virus outbreak, and the type A appears in the United States and Australia. The virus that appears in Wuhan belongs to the type B, which is derived from the type A mutation. This paper was published in the Proceedings of the American Academy of Sciences.
RightSouth: April 09, 2020. Original article: www.cam.ac.uk/research/news/covid-19-genetic-network-analysis-provides-snapshot-of-pandemic-origins (4-12 20:36)