The John Snow Memorandum, published in "The Lancet", is a response by 80 researchers denouncing the herd immunity approach of the Great Barrington Declaration. Taking its name from John Snow, the epidemiologist who worked on the 1854 Broad Street cholera outbreak, it states that the herd immunity idea is "a dangerous fallacy unsupported by the scientific evidence". It acknowledges that COVID-19 restrictions have led to demoralization, making such an idea attractive, but states that "there is no evidence for lasting protective immunity to SARS-CoV-2", adding that "such a strategy would not lead to the end of COVID-19, but instead result in recurrent epidemics, as was the case with numerous infectious diseases before the advent of vaccination."