Malaria is one that comes to mind. We can prevent it, have eradicated it from many countries, but the long tail will take a few more decades to reach planet-wide success.
There are charities that specialize in analyzing climate data to see where outbreaks may occur next. There are charities that just do government outreach to leaders that don't believe medicine is real.
The policies around measles vaccines have shifted a little since RFK became HHS Secretary, but not in a material way. Generally the messaging has focused on putting measles, mumps, and rubella in individual vaccines rather than combined, but at no point has the federal government recommended not to get vaccinated. That, combined with the Canadian data, implies that RFK or other changes to US health policy are not likely to be the cause of the measles outbreaks.
The elephant in the room that a lot of people don't want to talk about is mass migration from countries where measles is still a major thing... surely that contributes a bit.
I think the more honest people in the space acknowledge that’s at least one of, if not the major reason. The antivax movement contributes as well of course
