我之前看网上人说科兴各种问题或者效果不显著基本功能不够 但是后来听说美国入境承认这是有效疫苗 不知道哪个更有道理
https://www.reddit.com/r/Ocugen/comments/qgh2av/covaxin_officially_accepted_for_usa_travel/
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