OK, now I understand.
I'm simply trying to discern whether the inoculation prevents the flu or just lessens the severity of the misery.
What I've learned from my own research,suggests it's more of a mitigation of the flu's severity, rather than a preventitive measure.
Not that any mitigation isn't welcome, of course.
For what it's worth, and maybe DR can answer this, maybe I really don't know the difference between a nuclear cold and the flu.