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Expert: Mixing vaccines not recommended due to safety concerns
03:01

COVID-19 vaccine shortages and inequality of access are posing a growing challenge. In some countries, there's no guarantee of a second jab. So scientists are testing the efficacy of mixing vaccines. Health authorities in many countries remain cautious. For more, CGTN talked to Professor Wu Zhiwei from the Medical School of Nanjing University. He noted that mixing vaccine doses is normally not recommended due to safety and efficacy concerns.

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