Thanks to the delta variant, Bay Area coronavirus cases are rising yet again, just six weeks after California's big reopening. But this is a different kind of surge with very different lessons, says Chronicle health reporter Erin Allday. She tells host Demian Bulwa why the latest case rates may be a flawed measurement, and talks about what we need to know about breakthrough infections and booster shots. Also: Do mask-wearing and social distancing need reconsideration in a post-vaccine world? | Unlimited Chronicle access: sfchronicle.com/pod

Learn more about your ad choices. Visit megaphone.fm/adchoices