The race for a COVID-19 vaccine, explained

There's new hope this week in the quest for a COVID-19 vaccine. Trials for two vaccines, one at Oxford University and another being worked on here in Canada, are showing some promising results. And they're just two possible frontrunners from scores of vaccines being tested around the globe. Today, Emily Chung, the creator of CBC's vaccine tracker, tells us where we are on the path to approving vaccines, and what bumps may lie in the road ahead.