File photo of disease control and prevention workers collect samples from frozen products in Tianjin's Nankai district on Nov 9, 2020.- China Daily
BEIJING (China Daily/Asia News Network): Chinese researchers are calling for global cooperation to improve understanding of the spread of SARS-CoV-2 via cold chains as part of efforts to trace the origins of the virus.
The first phase of WHO-organised studies into the origins of the virus that causes Covid-19 wrapped up in China in February and identified the cold-chain theory as a possible explanation for its spread across populations.
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