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Global herd immunity with COVID-19 vaccines will take 2-3 years: Chinese top epidemiologist Zhong Nanshan By Wan Lin Published: May 13, 2021 06:45 PM Zhong Nanshan Photo:VCG Achieving global herd immunity against COVID-19 through mass vaccination will take two to three years, said China's top respiratory disease specialist, Zhong Nanshan.Zhong made the remarks at a conference of the Science Council of Asia held in Guangzhou, South China's Guangdong Province on Thursday, during which he made a speech about China's COVID-19 prevention and control strategy and vaccine development and shared his views about reaching herd immunity against COVID-19 around the world....
