WHO set the vaccination goal for mid-2022, but health researchers say the mutating virus that spreads more easily means we need to set new priorities for global health.
About 63% of Americans have gotten at least one vaccine dose. The Biden administration wants to get to 70% by July 4.
Health professionals in Arkansas say there are a variety of reasons why people there are hesitant to get vaccinated.
For COVID-19, predictions of what it will take to reach herd immunity vary wildly, and it's more complicated than one magic number.