The closest is 1300 miles that they are aware of. There is speculation similar versions could be in caves not yet discovered, or someone transported a bat from the cave or location.
Yes you bring up an argument, but then you should have patient 0 in the lab escape. Effectively you are stating a scientist was infected and then would have spread quickly throughout other scientists, their families and others. That didn't occur here, the wet market is effectively the epicenter, then growing from there. So you are either stating they had infected bat they sold at the wet center, 2 they had a scientist who was sick, that didn't get any other employees or family sick, but went to the wet market? Or stating the chinese manipulated the data. A couple non chinese scientists have stated no one seemed to get sick at the lab. Now whether you think they are lying, I tend to take it as fact unless proven otherwise.
Both are plausible explanations and possibilities, I still lean more towards natural. I don't think you will have anyone agree unless there is a smoking gun.
The below article and research was done in 2006.
In China, close contacts between humans and food animals have resulted in the transmission of many microbes from animals to humans. The two most notable infectious diseases in recent years are severe acute respiratory syndrome and avian influenza. ...
pmc.ncbi.nlm.nih.gov
Purpose of review
In China, close contacts between humans and food animals have resulted in the transmission of many microbes from animals to humans. The two most notable infectious diseases in recent years are severe acute respiratory syndrome and avian influenza. In this review, these two severe zoonotic viral infections transmitted by the respiratory route, with pandemic potential, are used as models to illustrate the role of Chinese wet-markets in their emergence, amplification and dissemination.
Recent findings
Two research groups independently discovered the presence of severe acute respiratory syndrome coronavirus-like viruses in horseshoe bats. An astonishing diversity of coronaviruses was also discovered in different species of bats. For the recent and still ongoing avian influenza H5N1 outbreak that originated in Southeast Asia, from 2003 to 21 April 2006, 204 humans have been infected, with 113 deaths. Most patients had recent direct contacts with poultry.
Summary
In Chinese wet-markets, unique epicenters for transmission of potential viral pathogens, new genes may be acquired or existing genes modified through various mechanisms such as genetic reassortment, recombination and mutation. The wet-markets, at closer proximity to humans, with high viral burden or strains of higher transmission efficiency, facilitate transmission of the viruses to humans.