2004https://www.webmd.com/lung/news/20040423/china-sars-death2008https://www.pnas.org/content/105/50/199442010https://link.springer.com/article/10.1007/s00705-010-0729-62014https://slate.com/technology/2014/04/how-dangerous-viruses-could-escape-from-laboratories.html2015https://www.nature.com/news/engineered-bat-virus-stirs-debate-over-risky-research-1.18787https://www.nature.com/articles/nm.3985?fbclid=IwAR0iTTfDlT-uxNFPtvQH-xFrF6QaF1hKE1Ey2TPrEi17XfFUElbpUlAosDc2017https://www.nature.com/news/inside-the-chinese-lab-poised-to-study-world-s-most-dangerous-pathogens-1.214872019https://www.newsweek.com/2019/11/01/synthetic-biology-manmade-virus-terrorism-1467569.htmlYou can see what the scientists were doing on the abstracts. Many cases, they were editing the virus to make it more infectious for testing purposes. Also, remember these stories?2019https://www.universalhub.com/2019/chinese-researcher-nabbed-liquid-filled-vialshttps://www.cbc.ca/news/canada/manitoba/chinese-researcher-escorted-from-infectious-disease-lab-amid-rcmp-investigation-1.5211567https://www.cnn.com/2020/01/28/politics/harvard-professor-chinese-nationals-arrest-espionage/index.htmlRight before Covid-19 came out.