What role could vaccine passports play in the pandemic?

After months of costly shutdowns, closed borders and curtailed personal freedoms, the concept of vaccine passports is gaining traction with governments eager to plot their path through the next phase of the COVID-19 pandemic. A number of countries, including China and Israel, have already rolled out their own forms of certification ostensibly intended to ease future international travel or revive activity in hard-hit sectors of economies, such as hospitality.