A passenger adjusts her face mask at the Harbin Taiping International Airport in Harbin, northeast China's Heilongjiang Province, Sept. 23, 2021.
A rapid COVID-19 testing center is seen in London, Britain, Aug. 30, 2021.
COVID-19 is the most serious pandemic and the biggest public health emergency the world has experienced in a century. The origins-tracing of SARS-CoV-2 aims to identify the zoonotic source of the virus and the route of introduction to the human population, including the possible role of intermediate hosts.
KATHMANDU, Sept. 29 (Xinhua) -- Science holds the key to origins tracing of COVID-19, an issue "much politicized" by some powerful countries, and the U.
