Some experts and vaccine developers in the West have warned against the premature authorization of coronavirus vaccines before last-stage trials are completed. Zheng Zhongwei, an official with China's National Health Commission, said Friday that China's cabinet, the State Council, approved a trial plan for the emergency use of Covid-19 vaccines at the end of June. "After the approval, we communicated and informed the relevant representatives from the WHO office in China and gained the understanding and support of the WHO," he told a news conference.