China is striving to expand its Covid-19 vaccine development with 20 candidates being tested in clinical trials.“China is in the world’s first phalanx in terms of the number of Covid-19 vaccines in the pipeline,” said Zheng Zhongwei, director of the Development Centre for Medical Science and Technology of the National Health Commission.“But we have to admit that our vaccine companies are still behind when it comes to carrying out international clinical [trials],” he said. “We still have…


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