In 2004, Professor Wu Chung-I, a well-known evolutionary geneticist, published a paper in the journal Science, systematically analyzing the evolution of the SARS virus. But now, as the mutant Delta strain spreads worldwide, some countries continue to use the COVID-19 pandemic for political maneuvering. In a recent interview with CGTN anchor Liu Xin, Professor Wu said, proposing reasonable hypotheses and seeking scientific evidence is the key to tracing the source of the virus, and is also the right scientific approach.