CBS Evening News with Norah O'Donnell, 07/27

On tonight's CBS Evening News podcast - the largest vaccine trial for COVID-19 enters Phase 3 at over 80 sites in the US -- is there reason for optimism and when might we know if the vaccine works? Also - discouraging news for fans of America's pastime; two Major League Baseball games now cancelled after more than a dozen players on the Miami Marlins test positive for COVID-19. What this could mean for the future of the season. 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