Summary: Health reporter Catherine Ho talks about a big change in the state's vaccine program that will steer 40% of the supply to eligible people in the roughly 400 lowest-income ZIP codes. The change seeks to smooth out what has been an uneven distribution of vaccines that's benefited wealthier residents. | Unlimited Chronicle access: sfchronicle.com/pod Learn more about your ad choices. Visit megaphone.fm/adchoices
