3 things happened at Wuhan Institute of Virology

In September 2019, 3 things happened at Wuhan Institute of Virology:
First, they deleted the viral sequence; this is very unusual, because usually researchers don't like to do this;

Second, the entire Wuhan Institute of Virology was taken over by the military. Based on my experience in military laboratories, this is too unusual;

The third is very illustrative. It is that the ventilation system of the Wuhan Institute of Virology has been redone.
These indicate that a major incident occurred at the laboratory in September.