In a rare admission, just days ago, Chinese health officials admitted that their CoronaVac COVID-19 vaccine doesn't have a high efficacy rate. A study released out of Chile does show some reasonable effectiveness of the Chinese vaccine. FOX's Trey Yingst speaks with Dr. Yanzhong Huang, Senior Fellow for Global Health Council on Foreign Relations, about the wide range of efficacy rates for the vaccine and what China will do about it.   

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