Kammala wannan jumla: John Snow Memorandum, wanda aka buga a "The Lancet", amsa ce ta masu bincike 80 da ke nuna rashin amincewa da tsarin rigakafin garken na Babban Bayyanar Barrington. Daukan sunansa daga John Snow, masanin ilimin cututtuka wanda ya yi aiki a kan
1854 Broad Street cutar kwalara, ta bayyana cewa ra'ayin rigakafin garke "rashin hankali ne mai haɗari wanda ba shi da hujjojin kimiyya". Ya yarda cewa ƙuntatawa na COVID-19 ya haifar da rashin jin daɗi, yana mai da irin wannan ra'ayin mai ban sha'awa, amma ya bayyana cewa "babu wata shaida ga rigakafin kariya mai ɗorewa ga SARS-CoV-2", yana ƙara da cewa "irin wannan dabarar ba za ta haifar da ƙarshen COVID-19 ba, amma a maimakon haka za ta haifar da barkewar annoba, kamar yadda lamarin ya kasance tare da cututtukan cututtukan cututtuka da yawa kafin zuwan allurar rigakafi. "