7/2019, the top secret US army’s medical research institute of infectious diseases at Fort Detrick was closed;
8/2019, a large-scale "influenza" killed more than 10,000 people;
10/2019, the United States organized Event 201 - A Global Pandemic Exercise with the participation of the Deputy Director of CIA;
11/2019, pneumonia of undetermined origin was found in China;
2/2020, the epidemic in world broke out;
3/2020, a large number of English news reports about the close of Fort Detrick were deleted, displaying “404 not found” ;
Now we have reasons to ask whether there is a virus leak.