Post infection natural immunity, debate and implications for mandatory vaccination https://www.bmj.com/content/374/bmj.n2101 US as of 11th December 2020 https://web.archive.org/web/20210115184811/https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burden.html US, Natural infection, Feb 2020 to May 2021 0 – 17 26.8 / 73 37% 18 – 49 60.5 / 138 44%…

Zinc and immune function: the biological basis of altered resistance to infection https://pubmed.ncbi.nlm.nih.gov/9701160/ Zinc is known to play a central role in the immune system and zinc-deficient persons experience increased susceptibility to a variety of pathogens It is clear that…

Herd immunity will not come Prof Andrew Pollard, Oxford vaccine team Clear that the delta variant can infect people already vaccinated Making herd immunity impossible to reach even with high vaccine uptake Anyone who is still unvaccinated will, at some…

Natural infection and / or vaccination? and Special report Mississippi Delta in UK Viral burden and vaccine effectiveness against new SARS-CoV-2 infections in the UK Delta infections after two vaccine doses had similar peak levels of virus to those in…

USA, Natural immunity key Nationwide Blood Donor Seroprevalence Survey Data, gathered from blood donors Estimates of population, 16 and older, have developed antibodies Vaccination or infection? March 21st 2021 Seroprevalence, 49.1% Over 16 vaccinated, 13.7% Cumulative reported cases, 8.7% Deaths…

Duration of Antibody Responses after Severe Acute Respiratory Syndrome (2007) n = 176 SARS-specific antibodies were maintained for an average of 2 years Significant reduction of immunoglobulin G in the third year Covid-19: Do many people have pre-existing immunity? But…