"about half of Republicans under 50 say they won’t get a vaccine."

Could be the same group that believes the Earth is flat, NASA did not send a man to the moon, there's a cabal of blood drinking pedophiles led by Hillary Clinton, the 2020 election was stolen and God sent Donald Trump to save the world (LOL). So what do you expect when a large portion of the country has the mentality of the Flintstones?

Make a vaccine card required for entry into supermarkets, movie theaters, schools, shopping malls, sporting events, concerts, etc.