The Coronavirus Vaccines Were Developed in Record Speed. Now, the Hard Part.

Dr. Walensky’s study found that the most important factor in a given vaccine’s success is not necessarily how well that vaccine works. It’s everything else: how quickly and strategically the vaccine is distributed across the country, how well received it is and whether people continue to abide by other edicts, like mask wearing and physical distancing. “We find that factors related to implementation will contribute more to the success of vaccination programs than a vaccine’s efficacy as determined in clinical trials,” Dr. Walensky and her co-authors wrote.