A third promising COVID-19 vaccine candidate has released promising trial results this week.
Although its efficacy numbers are less impressive than the Pfizer/BioNTech and Moderna vaccines, the Oxford-AstraZeneca vaccine has some important advantages in its favour.
At the same time there's increasing scrutiny of the Oxford trial results with concerns around an accidental low dose sub-group and the method for calculating the results.
To weigh up the pros and cons of the various vaccine candidates is Dr Chris Smith. Chris is a consultant clinical virologist at Cambridge University, and one of BBC Radio 5 Live's Naked Scientists.
Photo: Verwendung weltweit/ AFP
