China and the World Health Organization have discussed the need for “stronger collaboration” on tracing the origins of Covid-19, amid tensions over the WHO’s plans to further investigate the theory that the virus could have leaked from a Wuhan lab.This came as WHO chief Tedros Adhanom Ghebreyesus met Chinese Premier Li Keqiang in Beijing on Saturday, where they also asserted the need to aggressively pursue vaccine equity.Tedros, who attended the Beijing Winter Olympic Games opening ceremony on…

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