The World Health Organization is urging the global community to join a pact by the end of this month that would see wealthier countries commit to sharing potential COVID-19 vaccines with developing countries, and with each other. It's an attempt to stop countries from engaging in what the WHO calls "vaccine nationalism."

Today, CBC science and health reporter Emily Chung joins us to talk about what vaccine nationalism is, and why many health experts worry it could threaten the global response to COVID-19.