- Brazil downgrades efficacy of Chinese COVID-19 vaccine | TheHillThe Hill
- Chinese Covid-19 vaccine far less effective than initially claimed in Brazil, sparking concernsCNN
- Sinovac: Brazil results show Chinese vaccine 50.4% effectiveBBC News
- Brazil researchers now say China’s Sinovac vaccine is 50% effective — lower than announced earlierCNBC
- Disappointing Chinese Vaccine Results Pose Setback for Developing WorldThe New York Times
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