16 April 2020 - Around the world, hope for a return to normalcy is pinned on a vaccine, the “ultimate weapon,” as it’s been called by officials like Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases.
But it’s still unclear how successful a vaccine against SARS-CoV-2, the virus that causes COVID-19, can be.
A lot will depend on how the virus mutates. Broadly, there are two ways mutations can play out.