https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3209347/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3335060/

https://www.ncbi.nlm.nih.gov/pubmed/22536382

https://www.ncbi.nlm.nih.gov/pubmed/18941225

https://www.jimmunol.org/content/181/9/6337.long

https://www.ncbi.nlm.nih.gov/pubmed/27269431

https://www.ncbi.nlm.nih.gov/pubmed/17194199

https://jvi.asm.org/content/78/22/12672.abstract

https://science.sciencemag.org/content/303/5660/944.full

I cannot find any research that does not reveal dead or attenuated SARS vaccines cause increased morbidity and mortality. All such studies show that result, including a human trial of RSV (respiratory syncytial virus) in which two infants died.

Nonetheless, China did undertake human trials of SARS vaccines. I had hoped that those trials were responsible for the morbidity and mortality SARS2 caused in China, but the ongoing epidemics in WA, USA, Italy, and Iran prove such SARS vaccine trials were not significant factors in human suffering and death from SARS2.