Natural versus vaccine immunity

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 328 37 Immunological memory to SARSCoV2 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 SARSCoV2 spike increased between 1 month and 8 months after infection. Proportion of subjects positive for CD4+ T cells (92) remained high at 6 to 8 months after infection. The different types of immunememory each had distinct kinetics, re