""" If universal, timely, free access to a vaccination becomes possible, then it could be ethically permissible to require vaccine certification for participati

""" If universal, timely, free access to a vaccination becomes possible, then it could be ethically permissible to require vaccine certification for participation in certain activities. But if access to a vaccine is limited in any way, then some of the inequities we highlight could still apply, as the literature on uptake of other vaccines attests """