Ok, it's simpler then that: mRNA is a recipe to initiate construction of a protein molecule (a meal). The DNA sends out these recipes about a hundred thousand times a day to maintain and repair the cell while the DNA prepares for replication (split phase), which replaces cells that must undergo Apoptosis (cell death). This injection proposal is changing the recipe the DNA is delivering and consequently will have affect on the overall health of the cell. This procedure must inform the immune system within the cell to allow this transformation to take place and consider it as a normal procedure during the processes. The problem is, this manipulation is unpredictable and rightly so. To build antibodies against a spike protein means you must have a copy of the spike protein in the first place, and that has not been obtained, not by any country outside of Wuhan China. Now lets look back at what happened in China ? Wuhan Level 4 Lab makes a bioweapon using the SARS virus and adapts a spike protein to it so it can be contractible by Human Beings. They fabricated a certain amount and sent it over to the processing institute for containment and distribution. Someone knew what this weapon was for and decided to thwart the program by "murder suicide", destroying the biological weapon which killed thousands of people there. The practitioners trying to treat the infected got infected themselves by the replicating virions the victims were emitting and thus a pandemic of second generational viruses are contagiously spreading across the world. It's nothing more then a "second generation virus", a FLU. You'll get a bad congestion where some may get fevers and others don't, but you will not die unless you have serious health conditions in the first place. Your immune systems will unleash a lysogenic cycle and develop antibodies against all future contractions from this "second generation viral infection." Eat well, take care of yourself.