To clarify my statement from earlier, since people seem to be losing their shit over it, some newer experimental vaccines that target cancers (especially with increasing links between H. pylori and stomach cancer/herpes and cervical cancer) and their associated bacterial and viral roots are more therapeutic than prophylactic.
In the case of the majority of vaccines that give you some varied (dead, smaller, recombinant, etc.) version of the bug, it's a challenge to make these kinds of vaccines for viruses that have rapidly and vastly mutating strains, such as HIV and influenza. The same can be said (though to a lesser extent) about malaria.
I was hopeful before reading this that they were attempting something closer to an experimental vaccine along the lines of cancer vaccines rather than the same tried and failed methods of the past 100 years or so.
Admittedly, it came out sounding dumb.
And also I'll admit that any progress towards such a deadly infectious disease is good progress. However, working in the research community (on the publishing side, not the science side) I read about "breakthroughs" every single day of the week and admittedly get jaded about the word. I don't mean to purport more understanding about this vaccine or vaccines in general than I actually have, so I'll step away now.
Carry on.