I'm guessing the vaccine is in phase 4 (sort of). It's a little weird with this one. Most of the early work was done around 20 years ago, when the 2014/15 pandemic hit they went into trialling it. It was used extensively in this outbreak as a control stratagem, my guess is that will continue to be the way it's used, I'd be surprised if it ended up being a stranded vaccine like measles.

No problem, its a win/win!