Wuhan is a huge city with the only lab on earth that works with SARS, virus-leak is not uncommon in China over the years(including SARS-1 that was leaked a few times but was contained quickly), after COVID China issued lots of new policies including stricter lab management, and new leadership from military to be in charge of Wuhan lab, and hide the initial samples of COVID, and started a diplomatic propaganda to paint USA as the virus maker.