Problem is, there is this informed consent thing in American medicine whereby an adult has jurisdiction over his own body and nobody can force treatments even if determined medically necessary and in the best interest. Only when the person is determined to lack decision making capacity can another individual, i.e. NOK can intervene to give approval so a treatment can be given. And even then there is the possibility of requiring restraint if the person is combatively resisting. So, for a flu shot? Nobody is going to that extreme without a court order. I'm sure you know all this, but ask me the time and I'll build you a clock. LOL
We once had a patient, physically incapacitated including an infected sacral ulcer. He refused being bathed, turned, cleaned after BM, having his sacral wound dressings changed. Refused tube feeings (I forget why he couldn't or wouldn't eat), told the nurses not to hang the antibiotic IVs. They had to obey him or it could be considered assault. You can imagine how odorous his room and the whole hallway became after days of this, not to mention the harm to his sacral ulcer from laying in his own waste (and who wants do do that anyway?!). They called the ethics committee of which I was consultation coordinator. We had him evaluated by psychiatry who determied he did NOT have capacity to refuse these treatments (turning, bathing, sacral care, tube feedings, antibiotics). Next was to obtain consent from his brother, his NOK, to perform these specific treatments even against his wishes. The attending MD then explained to the patient that these specific treatment WILL be performed against his wishes because they were necessary to his well being. Everything extensively documented in case it went to court, and instructions for nurses to procede in case he refused. Actually, after all that he didn't put up much of a fight. It could be deduced that this was the only way this poor soul could be in control, to refuse treatments and have everyone in a dither about it, since he couldn't do much else. But that's the extreme end of forcing treatments on a person who wouldn't give consent for treatments in his best interest. There were others, this one was just memorable.
Where I worked we were given flu shots every year. The Infection Control nurses came around with their carts to every unit and office to give the shot. How much more convenient could it be? And every patient admitted to the hospital was offered the shot. Always in the fall, flu shot season. Anyway, there were always those who refused the shot. There was a time when some hospitals in the area mandated everyone had to take the shot OR had to wear a mask while at work. That fizzled after a while, I think. They didn't want to have to take it to the Supreme Court or something. Anyway, you can lead a horse to water, but in the US you can't make him take a flu shot.
Maybe some private businesses can do their own thing, like terminating anyone who won't take the shot, but again you have employement laws up against you, which we know are not in the best interest of the business or its customers. I've lately seen "No mask, no entry, no service" signs on some eateries just lately. At least a few are getting it.
JHMO.