Natural Immunity is Durable: Science Summary and Labs 11 Months Post-Infection

by Mike Mutzel


Let's have an objective look at the latest science investigating the durability of immunity from prior infection.




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Related Assessment Tools:

Think you've been exposed to COVID-19? Test your T cell's response to the antigen:


IgG antibody immunity test from Lab Corp:

SARS-CoV-2 Semi-Quantitative Total Antibody, Spike

SARS-CoV-2 Antibodies, Nucleocapsid


Time Stamps:

00:30 The CDC internal report on natural immunity does not corroborate with the body of evidence that has been published here in the US and throughout the world.

01:05 Rates of reinfection for those previously infected are less than 1%.

03:29 can test your T cell immunity.

03:40 When you are exposed to a pathogen, your innate immune system is activated. Over time, your T cells will recognize the intruder and create a memory. The memories are translated from your T cells to your B cells. B cells then make antibodies.

04:15 Antibodies naturally decay over time. Upon re-exposure to the pathogen, plasma cells can be upregulated on demand. This probably lasts for a lifetime. 90+ years after being exposed to the 1918 Spanish flu, elderly individuals still had antibodies.

06:45 The nucleocapsid is not part of the vaccination. If that is increased, there is a good chance that you have had exposure to the virus.

07:50 Natural immunity in those previously infected is at least as protective as vaccination.

08:30 If you had the illness and two rounds of the vaccine, you are more likely to experience COVID-like illness again.

09:05 Individuals who had documented prior infection, made up 1% of new cases. Individuals who had been fully immunized represented 40% of new cases.

09:40 Although antibodies declined over 8 months, memory B cells increased and the half life of memory CD8 and CD4 T cells suggested a steady presence.

10:10 The number of people who need to receive a substance to prevent one adverse outcome, in those with previous immunity, was 218. This compares to 6.5 in those with no immunity.

11:00 There was no difference in incidence of infection between individuals infected but unvaccinated to those infected but had been vaccinated, found a large study.



Centers for Disease Control and Prevention. (2021). Laboratory-Confirmed COVID-19 Among Adults Hospitalized with COVID-19–Like Illness with Infection-Induced or mRNA Vaccine-Induced SARS-CoV-2 Immunity — Nine States, January–September 2021, 1–6.

RESEARCH NEWS: Antibodies To 1918 Flu Found In Elderly Survivors
BMJ, J. B.,. (2021). Vaccinating people who have had covid-19: why doesn't natural immunity count in the US?

Shenai, M. B., Rahme, R., & Noorchashm, H. (2021). Equivalency of Protection From Natural Immunity in COVID-19 Recovered Versus Fully Vaccinated Persons: A Systematic Review and Pooled Analysis. Cureus, 13(10).
Kojima, N. (2021). Necessity of COVID-19 Vaccination in Previously Infected Individuals: A Retrospective Cohort Study, 1–22.

Kojima, N. (2021). Incidence of Severe Acute Respiratory Syndrome Coronavirus-2 infection among previously infected or vaccinated employees, 1–11.
Kojima, N., Health, N. S. E. T.,. (2021). A Systematic Review of the Protective Effect of Prior SARS-CoV-2 Infection on Repeat Infection.

Video Time Stamps:

00:30 The CDC internal report on natural immunity does not corroborate with the body of evidence that has been published here in the US and throughout the world.

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