Here's what stopping modern medicine from doing that:
1) we don't know how to make what you describe
2) if we did, we don't know if it would be safe to put in humans
3) the consequences getting this wrong could be very severe
4) getting such a thing approved would be nearly impossible because we have no idea how to evaluate something like this.
It's not from lack of imagination- even if you solved the technical difficulties (which are copious), there would still be huge regulatory burdens to overcome (which are even harder to overcome than medical research).
With that said, we've already done similar things with lentivirus, https://en.wikipedia.org/wiki/Lentiviral_vector_in_gene_ther... but one side effect is cancer, another being complex immune system reactions. Lentivirus are useful because they can invade non-dividing cells, for example nerve cells aren't dividing, which means most viruses won't target them.
I worked in this field for a few decades but it was all wasted time. Nobody is going to support you working on a research project like this.
Here's what stopping modern medicine from doing that: 1) we don't know how to make what you describe 2) if we did, we don't know if it would be safe to put in humans 3) the consequences getting this wrong could be very severe 4) getting such a thing approved would be nearly impossible because we have no idea how to evaluate something like this.
It's not from lack of imagination- even if you solved the technical difficulties (which are copious), there would still be huge regulatory burdens to overcome (which are even harder to overcome than medical research).
With that said, we've already done similar things with lentivirus, https://en.wikipedia.org/wiki/Lentiviral_vector_in_gene_ther... but one side effect is cancer, another being complex immune system reactions. Lentivirus are useful because they can invade non-dividing cells, for example nerve cells aren't dividing, which means most viruses won't target them.
I worked in this field for a few decades but it was all wasted time. Nobody is going to support you working on a research project like this.