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[–]zyxzevn[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

So instead we test them on humans.

Here is one of those vaccine/mRNA studies:
SARS vaccine linked to liver damage in ferret study

[–]InvoluntaryHalibut 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I assume this was an effect of the ADE phenomenon.

https://onlinelibrary.wiley.com/doi/10.1111/ijcp.13795