I'm not a vax fan in general, I don't get the people flu vax, so I'm not the most helpful here.
I do know it's only meantfor dogs in high dog areas, generally kenneled or sheltered. The daycare I take jazz too is monitoring the situation and they thus far are not requiring it. Luckily they accept jazz's vaccine waivers, though she did have one vax in the shelter as a pup.
She also came to me with severe IBD as a pup, no telling what contributed to that.