Summary: Indoor mask mandates are back in seven Bay Area counties because of the highly transmissible delta variant, and the risk isn't just for unvaccinated people: post-vaccination cases are also on the rise. UCSF's Dr. Bob Wachter joins host Cecilia Lei to explain breakthrough cases, and what the latest public health guidance means for the future of the pandemic. Learn more about your ad choices. Visit megaphone.fm/adchoices
