The vaccine makers in collaboration with lawmakers and powerful investors like Bill Gates have changed the definition of vaccine to their advantage. The very definition of vaccines used to be an injection of dead virus cells into the body so that the body’s immune system produces antibodies to fight the virus when and if it came in contact. But for covid and the impending profit from vaccine sales they changed the whole concept of vaccine by introducing a novel concept of mrna without enough studies. Mrna is supposed to teach body cells to fight covid by using genetic code. The fact that this is the first time its being used in a vaccine makes it an experimental drug in mass scale. It is not known how mrna would react to other virus or other strains. It is said that in very near future one mrna vaccine will be used to cure multiple viruses. In some sense the mrna vaccinated into human body could act as an operating system that can be updated to fight different viruses. This is why mrna technology becomes a bit risky as different things can affect the mrna which is being called as genetic code. Maybe it would be possible to hack the code?? You never know.