Understanding the Chinese vaccines may help us understand the COVID surge in China

The world is trying to understand the causes of China’s unprecedented COVID surge as we watch news about China’s overcrowded hospitals and packed crematoriums. But Beijing is not sharing data about the outbreak. Chinese people have been discussing Chinese-made vaccines. And how they are made may be problematic. I found one survey that accidentally revealed the role Chinese vaccines have played.
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References：
https://mp.weixin.qq.com/s?__biz=MjM5OTExMjYwMA==&mid=2670092497&idx=1&sn=0612c3bff34ae4dcca3c1127147e324d&chksm=bc12ba268b65333016dddfd1ee6f1e8515253c4ae3506d71605583aefb7e6561837986e0d8e7&scene=27#wechat_redirect
http://www.stdaily.com/cehua/kbstjj/2021-07/20/content_1198417.shtml
https://asia.nikkei.com/Spotlight/Caixin/Key-facts-to-know-about-China-s-vaccine-race