Guest: Kenyon Wallace, investigative reporter for the Toronto Star

Amidst a growing fourth wave, the spread of the Delta variant and questions over how long immunity lasts, a number of nations around the world, including the United Kingdom, Germany, France, Israel and Canada are either considering or have begun COVID vaccine booster programs. But now, the World Health Organization has officially called for a moratorium on vaccine boosters, particularly in high-income nations. We explain the timeline of vaccine boosters, who is getting them right now and the ethical minefield that come with them as billions around the world await even a first dose.