The same Wuhan lab was involved in defective vaccines in 2017: https://www.cnn.com/2018/07/23/asia/faulty-vaccine-china-intl/index.html "In a statement, the Jilin Provincial Food and Drug Administration said a total of 253,338 doses of Changsheng's DPT vaccine were faulty. This batch was sold to the Shandong Provincial Disease Prevention and Control Center. It follows an earlier incident, in November 2017, when at least another 400,000 doses of the same vaccine, produced by a different, second company, the Wuhan Institute of Biological Products, were found to be substandard."