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10052364 2021-06-23 20:22:28.0 COVID-19 origin tracing timeline: Studies show earlier emergence worldwide 2 86745 Opinions opinion /enpproperty-- >To determine the origin of COVID-19 is thought critical to preventing future resurgence of the virus and developing efficient treatments for the disease. Since the outbreak of the pandemic, intensive efforts have been made by scientists to trace the causative agent, SARS-CoV-2, and investigate its transmission, pathogenesis, and therapeutics. Following its release of the WHO-China joint report finding a lab-leak of the SARS-CoV-2 "extremely unlikely," the WHOâs call for further retrospective and systematic research around earlier cases and possible hosts has intensified global...
