On October 4, 2020, epidemiologists from Harvard, Oxford, and Stanford authored the Great Barrington Declaration, which advocates for ending the COVID-19 lockdowns and turning to a strategy of protecting elderly and vulnerable populations, while allowing everyone else to resume their normal lives.
Critics of the Declaration issued a counter-petition, called the "John Snow Memorandum," stating, "Any pandemic management strategy relying upon immunity from natural infections for COVID-19 is flawed. Uncontrolled transmission in younger people risks significant morbidity and mortality across the whole population."