Phylogeographic Mapping of Newly Discovered Coronaviruses

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3. The miner passage theory seems well supported,

Although the article was long and dense, so a bit challenging for me. But the bottom line seems to be that the virus's closest relative came from bats in a cave in SW China, and how or in what intermediary it mutated to its starting pandemic form is not known.

With one exception, "every virus in the SARS-CoV-2 clade falls on an almost perfect straight line. Beginning from the discovery location of RaTG13 (closest genome match to Covid 19), the further away from the mine (in Yunnan) a virus was found, the less closely related to SARS-CoV-2 it is."