Vaccination enhances immunity in people who previously had COVID-19; little evidence for claim that the Amish community in Lancaster County, PA, have herd immunity
In the spring of 2020, there were many cases of COVID-19 among the Amish and Mennonites of Lancaster County, PA. Because an estimated 90 percent of households had at least one COVID-19 case, this has led to claims that these communities have achieved herd immunity in the area, and because of this, the Amish don’t need to be vaccinated. However, due to low COVID-19 testing among Lancaster County Amish, it is difficult to confirm the herd immunity claim. Additionally, people who previously had a COVID-19 infection benefit from receiving the vaccines by boosting their protective immunity in a safer and more reliable way.