For China, it has been exposed to the Coronavirus virus in the Chinese city of Wuhan since the fall of 2019, specifically after the Military Olympics in that city. Chinese leaders consider that the epidemic was introduced to China by the American military delegation participating in these games. This entry might be a coincidence after the virus was engineered in a US military laboratory without taking the necessary precautions if the Chinese leadership wanted not to assume bad faith on the part of the Americans.
What strengthens the Chinese allegation is the recognition by Robert Radfield, the director of the Center for Disease Control (CDC), that a number of infections were discovered in the United States before they spread to China. But there is another account that says that the virus was French-made (made in 2003) and was transferred to a Sino-French joint laboratory that opened in 2017 in the city of Wuhan. Bats were experimented with, but one of the bats escaped from the laboratory and the epidemic occurred. However, regardless of the accounts and their accuracy, it has become clear that the greatest possibility is that the virus is man-made and not natural, and therefore open questions about bacterial experiments in laboratories and their feasibility and the possibility of turning them into a weapon of mass destruction.