The COVID-19 Virus Is Mutating. What Does That Mean for Vaccines?

As we enter the second year of living with the new coronavirus SARS-CoV-2, the virus is celebrating its invasion of the world’s population with yet more mutated forms that help it to spread more easily from person to person.

One, first detected in the U.K. in December, has already raised alarms about whether the COVID-19 virus is now escaping from the protection that vaccines just being rolled out now might provide. The variant has also been found in the U.S. Already, U.K. officials have tightened lockdowns in England, Scotland and...