Vaccines are a public good. And if we don’t make a lot more of them, COVID-19 may never really go away.  Gregg Gonsalves, an epidemiology professor at Yale’s School of Public Health who joined the show in May to talk about his career as an AIDS activist, explains to Jim and Maeve how our moral failure to help vaccinate the rest of the world may come back to haunt us — and what big steps we’d need to take to prevent that. Please fill out our listener survey at theatlantic.com/socialdistancesurvey. It helps us understand who we’re making this show for and how we can keep improving it. (And it helps us to make new shows that suit what you like!) Learn more about your ad choices. Visit megaphone.fm/adchoices