Expert calls for global effort in cold chain study on virus origins

Liu Jun, a professor at the Chinese Center for Disease Control and Prevention, suggested the international community adopt a way to cooperate while tracing the origins of COVID-19 in the next stage.

Medical tests on serum samples are needed, according to Liu. Further research can also check the medical records of workers affiliated with the cold chain that shipped contaminated goods from abroad to Wuhan's South China Seafood Market in 2019, he said.

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