Vaccine protection won't last as long as initially thought. The pharmaceutical AstraZeneca has gone through several rough patches in 2021, thanks to its COVID-19 vaccine developed in collaboration with Oxford University. But, the Swedish company may have finally found a break in the form of monoclonal antibody treatment, the first long-acting preventative method against the virus. Could this be a more effective way to battle COVID than vaccines? Therese Raphael contemplates.