Not sure but I can tell you how it is possible. I'm a geneticist if that is close enough. Chemicals in vaccines like aluminum compounds hyperstimulate the body to make antibodies against anything in there. That could be a toxin you want immunity to, or anything else. Since vaccines are produced using bovine products (fetal bovine serum), you can easily develop antibodies against beef. Same basic concept as your body making antibodies against the human fetal tissue that is in the final product which causes autoimmunity. Why it only affects some people and not others is a mystery. It is also important to note that even though the concept is sound, no vaccine has ever been proven to actually work. Trying to do this artificially may or may not work, it may only work through natural exposure.
This concept could be used to make you react to anything against which an antibody can be made. Some people have vaccine induced glycerin intolerances for example. In addition to fetal tissue and FBS, vaccines also often contain pig skin gelatin and egg proteins, meaning you can become allergic to chicken, pork, beef, and your own body from these injections (not specifically the mRNA ones, all vaccines). Never take a single one and never give them to your children.
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