Only about half of Americans say they would get a COVID-19 vaccine if the scientists working furiously to create one succeed, a number that's surprisingly low considering the effort going into the global race for a vaccine.

But more people might eventually roll up their sleeves: The new poll from The Associated Press-NORC Center for Public Affairs Research found 31% simply weren't sure if they'd get vaccinated. Another 1 in 5 said they'd refuse.

Health experts already worry about the whiplash if vaccine promises like President Donald Trump's goal of a 300 million-dose stockpile by January fail...