How will the coronavirus pandemic end? We are learning more about several possible paths. One is a vaccine in the works. Another is the concept of herd immunity. Andrew Noymer, a public heath professor at University of California, Irvine, explained how herd immunity works. … “Herd immunity is the concept that once a certain proportion of the whole population is immune, the virus has a really hard time bouncing from person to person. And so, what we want to get to eventually is a situation where most people are immune and then the epidemic will die out,” Noymer said.