Not sure what your point is. If you want to inject genetic material inside an organism to destroy one cell - with the mRNA platform you can only do it once. It

Not sure what your point is. If you want to inject genetic material inside an organism to destroy one cell - with the mRNA platform you can only do it once. It won't repackage itself and 'infect' another cell. If you want to make conditions inhospitable for an organism, you can cause a mass-scale change that affects multiple cells via a drug.