Abstract

Although COVID-19 vaccine credentials for international travel are an unwelcome or dangerous concept to some in the developed world, such measures are an essential component of global public health in some of the poorest countries of the world, in particular to prevent the spread of yellow fever. If one accepts the liceity of vaccine credentials for yellow fever in the developing world, then one has to do the same with similar credentials for COVID-19. A COVID-19 vaccine credential will allow developing countries to reopen their borders and economies long before they can attain herd immunity. It will be a lifeline for economies that have been ravaged by the global pandemic. It will be part of the global common good.