> They just aren't very similar beasts
It took a lot of HIV vaccine research to figure that out. Before that research, nobody knew. Of course now it is knows, when the people started, it wasn't clear what the problems will be.
Likewise, a lot of research is needed this time too. And the logistic needed to have the results usable is simply huge and everything needs time even if some steps are overlapped.
On that level, of still being far from having a ready solution, one can compare, on the level of the sameness of the virus it is of course now known that the viruses behave differently.
