[Comment] Developing COVID-19 vaccine policy in increments

Over the past several months, there has been fierce debate in the public domain as to whether booster vaccinations are needed to sustain vaccine-induced immunological protection against SARS-CoV-2 infection.1 Discussions in medical journals, news outlets, social media, and among the wider public have been robust but limited owing to the paucity of data for the breadth and durability of existing vaccines.