CBS Evening News with Norah O'Donnell 05/15

A look at a Covid-19 vaccine trial showing promising early results. What are researchers seeing and how soon could an effective vaccine really be available to the public? All that and more on tonight's CBS Evening News podcast. To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policy Learn more about your ad choices. Visit https://podcastchoices.com/adchoices