Thinking about the COVID‑19 pandemic, when, if ever, do you think the US will reach herd immunity? Herd immunity refers to a situation in which a large enough proportion of the population is immune to COVID-19 either from vaccine or from prior illness, which makes person-to-person spread unlikely. Published on May 6, 2021 → Survey conducted on May 6, 2021 on 9862 U.S. adults