The other mRNA vaccines that use a hosts own cells to make proteins have never made it through animal testing before.
The failed vaccines cause the immune system to ignore the viral proteins coming out of the host's cells. Then, when the body encounters the actual virus, the immune system ignores it and the host will die from uninhibited viral replication. This seems to be what's happening with some people who take the covid-19 vaccines.
Auto-immune response when another cov-variant is contracted. The bodies immune system gets confused by the mRNA similarities and goes full death blossom.
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