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Post infection natural immunity, debate and implications for mandatory vaccination US as of 11th December 2020 :// US, Natural infection, Feb 2020 to May 2021 0 – 17 26.8 / 73 37% 18 – 49 60.5 / 138 44% 50 – 64 20.4 / 62 32% 65 12.3 / 54 23% Total 120.3/ 328 37% Immunological memory to SARS-CoV-2 assessed for up to 8 months after infection N = 254 blood samples post infection N = 51 long term follow up Antibodies against SARSCoV- 2 spike and receptor binding domain (RBD) declined moderately over 8 months Memory B cells against SARS-CoV-2 spike increased between 1 month and 8 months after infection. Proportion of subjects positive for CD4 T cells (92%) remaine
