1st source:
https://www.frontiersin.org/articles/10.3389/fmicb.2018.02991/full
Scroll down to 'Coronaviruses Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) Just a snippet: "Vaccine-induced disease enhancement is also a concern with developing a SARS-CoV vaccine. This was reported in only small subset of SARS-CoV vaccine studies (de Wit et al., 2016). In a mouse study that investigated the role of SARS-CoV vaccine in inducing disease enhancement, Tseng et al. (2012) it was revealed that vaccines were able to protect against SARS-CoV infection, but still induced Th2 directed pulmonary immunopathology suggesting hypersensitivity to SARS-CoV components. In another study, post vaccination challenge of mice with SARS-CoV nucleocapsid protein induced sever pneumonia (Yasui et al., 2008). Likewise, double inactivated SARS-CoV vaccine in mice failed to provide complete protection and caused enhanced eosinophilic pro-inflammatory pulmonary response after infection (Bolles et al., 2011)."

In 2004 study caused hepatitis in ferrets:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC525089

In 2005 mice and civets became sick and more susceptible to coronaviruses after being vaccinated:
https://www.nature.com/articles/news050110-3#ref-CR1 https://www.pnas.org/content/102/3/797

2012 study - mice and ferrets developed lung disease:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3335060
2016 study of mice once again lung disease:
https://www.tandfonline.com/doi/full/10.1080/21645515.2016.1177688?scroll=top&needAccess=true&

The typical pattern in these studies above is that the children and the animals produced promising antibody responses after being vaccinated. The problem came when the children and animals were exposed to the wild version of the virus. When that happened, an unexplained phenomenon called Antibody Dependent Enhancement (ADE) also known as Vaccine Enhanced Disease (VED) occurred where the immune system produced a "cytokine storm" (i.e. overwhelmingly attacked the body) and the children and animals died.
https://science.sciencemag.org/content/303/5660/944.abstract
Which is precisely what one of the inventors of the mRNA technology, Dr. Robert Malone has been trying to tell everyone now for months.

Numerous attempts have been made to create viral vaccines and all ended in utter failure and all with same pattern - in the 1960's scientists attempted to create a RSV (Respiratory Syncytial Virus) vaccine for infants, in that study they skipped animal trials because they weren't necessary back then, but in the end the vaccinated infants became far more ill than the unvaccinated infants when exposed to the virus in nature, with 80% of the vaccinated infants requiring hospitalization and two of them died.
Since 2000 there have been many attempts to create coronavirus vaccines and all have ended in failure because the animals in the clinical trials became deathly ill and died, just like the children in the 1960's. I don't what is wrong with you people and why you're all so lazy you can't even be bothered to research and find the studies yourselves- it's not like a debate on some abstract subject, this is your very health and LIFE in the balance. Pathetic.