The graphic below dating back to the fall of 2021, shows that after Russia the country with the biggest percentage of vaccine hesitancy is the US at just under 20% of the population. I am not all that surprised given two key factors: Americans' traditional mistrust of government and the spread of misinformation via social media platforms. In Europe, it is the Germans who hold the distinct honor of leading the pack in that same category. This is not an easily reparable problem with the only hope remaining that future strains of COVID mutate towards increasingly milder versions.
The fact that so many deaths are preventable with simply a deference to the science is what is particularly heart breaking in all this.