Summary: It's a bad trend at UC Berkeley and elsewhere: An outbreak of coronavirus cases tied to fraternity parties. The surge is threatening colleges' plans to reopen for the fall. Reporter Ron Kroichick talks about what campuses will look like, and how many students might opt out entirely. | Full coronavirus coverage: sfchronicle.com/coronavirus | Unlimited Chronicle access: sfchronicle.com/pod Learn more about your ad choices. Visit megaphone.fm/adchoices
