Since COVID-19 first took off, political leaders, infectious disease specialists, and the lay public have debated its origins. Eventually, two hypotheses emerged: Either the virus crossed over from animals to humans in a wet market in Wuhan—the city in which the disease first appeared—or it leaked from a Chinese lab,

Foreign ministry spokesman Mao Ning said the laboratory leak conclusion being extremely unlikely was reached by the China-WHO joint expert team based on field visits to relevant Wuhan laboratories.

Beijing dismissed the CIA's claim that COVID-19 likely originated from a lab, calling it “extremely unlikely.” The Chinese government pointed to findings from the China-WHO joint expert team, which concluded that a lab leak was highly improbable.