There are several differences between the seasonal flu vaccine and any of the medicines being discussed.

1. They are real vaccines. They inject part of the actual virus. if you take the same part of a new viral strain and inject that, the processes and other ingredients are all identical. If there is variation it is in the virus itself, and that is not the type of "variation" I was talking about at all.
2. I don't know much about how the influenza virus is processed for the vaccine, but looking at this, it seems the flu vaccines don't actually change except to use previously tested combinations of influenza viruses. I don't get that at all, and it sounds to me like a complete sham, but there it is, so your protest is moot.
3. In the case of the mRNA vaccine variants I was talking about, I meant variations in the mRNA, nanoparticles holding them, or the solution they are stored in. In the first case, if you inject one mRNA causing your cells to produce one protein, and then inject a different mRNA to produce a different protein, this becomes a completely different technology, even if it uses the same base delivery system and solution. Also, if you change any part of the delivery system or solution it is stored in, again, the difference in actual effect could be huge. By law, it requires a completely new testing program, most importantly including extensive animal testing (which was skipped in these trials).

There are several difference between the seasonal flu vaccine and any of the medicines being discussed.

1. They are real vaccines. They inject part of the actual virus. if you take the same part of a new viral strain and inject that, the processes and other ingredients are all identical. If there is variation it is in the virus itself, and that is not the type of "variation" I was talking about at all.
2. I don't know much about how the influenza virus is processed for the vaccine, but looking at this, it seems the flu vaccines don't actually change except to use previously tested combinations of influenza viruses. I don't get that at all, and it sounds to me like a complete sham, but there it is, so your protest is moot.
3. In the case of the mRNA vaccine variants I was talking about, I meant variations in the mRNA, nanoparticles holding them, or the solution they are stored in. In the first case, if you inject one mRNA causing your cells to produce one protein, and then inject a different mRNA to produce a different protein, this becomes a completely different technology, even if it uses the same base delivery system and solution. Also, if you change any part of the delivery system or solution it is stored in, again, the difference in actual effect could be huge. By law, it requires a completely new testing program, most importantly including extensive animal testing (which was skipped in these trials).