It appears the same company that deals with many live viruses in the same city as the corona virus outbreak also makes flu vaccines (influenza). This could be a possible way to spread it.

https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.bioplanassociates.com/publications/articles/VACCINES_China_Zhou_Apr07_ChinaB.pdf&ved=2ahUKEwi017Kuw6rnAhVEl3IEHQGCDPoQFjARegQIBBAB&usg=AOvVaw1CRxf4cVuon3vTdwBa-w7D&cshid=1580359912814