“Did you know that animal trials for mRNA had all of them die when a pathogen was introduced?”
That is absolutely false.
In past decades, when they tried a different vaccine, using a different technology (whole virus), for a different coronavirus (SARS); the test animals died when exposed to the actual virus. The whole virus approach was largely abandoned back then, and that well know risk was explicitly evaluated during the trials of the approved vaccines (In the USA, and in many other countries around the world).
It absolutely did not happen with mRNA vaccines.
Whole virus vaccines were attempted for both SARS-1 and MERS, cousin viruses of Covid-19, which itself is a type of SARS.
The whole virus vaccines succeeded in creating antibodies in the test animals.
But when the test animals were then exposed to the wild virus they experienced “antibody-dependent enhancement”, ADE, and they ended up dying from that.
The risk of ADE resulting from a whole virus vaccine was on the mind of all Covid vax developers and that is surely why none of the American vaxxes use it:
https://www.nature.com/articles/s41564-020-00789-5
The claim that the mRNA vaxxes have resulted in test animal deaths is nothing less than irresponsible rumor mongering. That’s why these claims are never linked to PubMed papers where we would see the data. The data doesn’t exist.