Future COVID-19 booster shots will likely need fresh formulations as new coronavirus variants of concern continue to emerge
- Written by David R. Martinez, Postdoctoral Fellow in Epidemiology, University of North Carolina at Chapel Hill

Being up to date on COVID-19 vaccines means having had three or four doses of the same shot at this point. Current boosters are the same formulations as the first authorized shots, based on the original strain of the...