To get a better understanding of "Zoonotic Transfers" read the attached article...

Wuhan is a huge city of over 12 million people...it's markets are a draw from a wide range of sources...not just within the city limits...viruses can jump from one animal species to another, and what started tens, if not hundreds of miles away can end up in a Wuhan market...read the article.

Link: https://news.emory.edu/features/2020/06/ehd-zoonotic-diseases/_old/article.html