In recent weeks, though, there’s been a question about how close we might get to true herd immunity, the state in which so many people are immune to the virus — mostly due to vaccinations — that it can’t spread easily even among the non-vaccinated. To hit that mark, as many people as possible need to get doses of the available vaccines. About a month ago, though, the number getting vaccines each day began to wane. The implication was that demand had collapsed somewhat short of the level of vaccination needed to hit that immunity mark.

Source: Washington Post May 13, 2021 19:51 UTC