https://www.nytimes.com/2019/08/05/health/germs-fort-detrick...
Considering the history of 'budget cuts to cut government spending' combined with 'innovation' causing many environmental and social disasters in the US, I see a lab leak from the US Army's lab in Maryland much more credible than anywhere else. Budgets get cut by 75% by Trump Admn. The Army labs 'get creative' in cutting costs and the rest follows.
The lab seems to have started having 'problems with its sanitation and security'. Upon which the US government tried to get the army shut it down. Army refused. The government had to get a court order to shut the lab down around June 2019. At this point, a 'pneumonia' outbreak was reported in the retirement communities around Maryland. Also, the army team that went to military games to China, Wuhan were trained here before leaving for China.
Note this kind of thing probably happened before, and it will happen again: Loosely regulated private and state GMO research is a MAJOR risk for entire humanity - just one lab screws up due to budget cuts or while trying to 'innovate', and you can never take back what gets out of that lab.