Earlier quoted context omitted.
Clinics routinely require staff and physicians to be vaccinated against the flu lest there be an exemption on file. Granted this article shared that the rate is low, it also surfaced mandates for healthcare: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3020194/
I have never heard of a population wide mandate for a flu vaccine however. And since 2004 the average effectiveness for the flu vaccine is about 40% so I guess if you are in a high risk group it might increase your survival a bit, but not enough effectiveness for a national mandate. The death rate of the flu is about 0.01% for all populations. I mean, would you get a surgery that had a 40% success rate if your chance…
A jab isn't as evasive as surgery, it doesn't carry the same risks,costs,time etc