Zombies, umbrellas, R-naughts - explaining coronavirus herd immunity and whether we can get there FacebookTwitterEmail 1of3 Some people sit the required 6-foot social distance away from each other Saturday, April 11, 2021, at Southside High School as they wait the required 15 minutes after they received the Johnson & Johnson COVID-19 vaccine while other people receive theirs during a clinic sponsored by the University of the Incarnate Word and Southside ISD. The more people get vaccinated, the closer the community gets to the goal of herd immunity, the point at which a majority of people are immunized and the chances of getting the disease are greatly reduced.William Luther /San Antonio Express-NewsShow MoreShow Less