Well, I'm not exactly sure what the line is. In the US, as with all things related to government power, it's decided jointly through the work of the three branc

Well, I'm not exactly sure what the line is. In the US, as with all things related to government power, it's decided jointly through the work of the three branches of government and the factors that influence them - democratic appeal, the constitution, jurisprudence, and so on. At any rate, "vaccination for a highly infectious, potentially deadly virus" indisputably counts as "health". Everything might be health-based if you want it to be (maybe), but the nature of the American system hopefully and usually minimizes room for abuse of that power - and certainly there's no appearance of abuse of that power here, now.