There is a related epidemiological consequence of great concern. It has been proven possible for a single mucosal cell to be infected ‘simultaneously’ by more than one viral seriotype. That is a simple math probability of virions and host cells Example: you have an easily transmissible ‘normal’ coronavirus cold already (defined below), go to Wuhan and also contract Wuhan. In your body those two different coronaviruses can now both be replicating in the same host cells, and because of RNA replication are indiscriminately exchanging genetic material. So you might end up with an attenuated virulence Wuhan, or a more virulent Wuhan—but most likely both.
The history of the 2009 Swine flu scare showed this. The novel new H1N1 seriotype started in Mexico, where my guy contracted his early fatal infection. For reasons explained below, flu is strongly seasonal. It was winter in South America, so the first hard hit country was Argentina. The mortality data were horrific (5.5%). But, this in hindsight meant the most virulent strains were already burning themselves out, since dead people cannot replicate virions. By the time swine flu reached the North American winter several months later, it was already significantly less virulent (1-2%, still very bad).