John Campbell’s List of Studies On Natural Immunity

He is Amazing, and Should Be Given an Honorary Everything.

I’ve watched John Campbell review all things related to COVID-19 since the beginning of the pandemic. He has proven to be 100% unbiased and willing to represent the evidence as well as he understands it.

His first video on Coronavirus aired Jan 26, 2020. He now has 1.2M viewers on YouTube – with endless videos, one or two per day, he has covered nearly every aspect of COVID-19 and SARS-CoV-2.

In this video, he reviews the scientific evidence of natural immunity, which he says “seems good and long-lasting and cheap, lots of evidence below.”

He expansion collection of links and annotations are provided below for those looking for resources on evidence of natural immunity.

Biological studies

Dan et al (2021) Science, Immunological memory to SARS-CoV-2 assessed for up to 8 months after infection.

95% of participants tested retained immune memory at about 6 months after having COVID-19

More than 90% of participants had CD4+ T-cell memory at 1 month,

and 6–8 months after having COVID-19

Wang et al (2021) Science, Ultrapotent antibodies against diverse and highly transmissible SARS-CoV-2 variants

Previous SARS-CoV-2 infection, with an ancestral variant produce antibodies that cross-neutralize emerging variants of concern with high potency

Epidemiological studies

Hansen et al (2021) Lancet, Assessment of protection against reinfection with SARS-CoV-2 among 4 million PCR-tested individuals in Denmark in 2020: a population-level observational study

People who had had COVID-19 previously were around 80·5% protected against reinfection

Pilz et al (2021) European Journal of Clinical Investigation, SARS-CoV-2 re-infection risk in Austria

Sheehan et al (2021) Clinical Infectious Diseases, Reinfection rates among patients who previously tested positive for COVID-19: a retrospective cohort study

Shrestha et al (2021) Preprint, Necessity of COVID-19 vaccination in previously infected individuals

Retrospective cohort study in the USA,

People who had had COVID-19 previously were 100% protected against reinfection

Gazit et al (2021) Preprint, Comparing SARS-CoV-2 natural immunity to vaccine-induced immunity: reinfections versus breakthrough infections

Kojima et al (2021) Preprint, Incidence of severe acute respiratory syndrome coronavirus-2 infection among previously infected or vaccinated employees

Laboratory staff routinely screened for SARS-CoV-2, people who had had COVID-19 previously were 100% protected against reinfection

Clinical studies

Large, multicenter, prospective cohort study

Previous COVID-19 diagnosis, 84% decreased risk of infection

Letizia et al (2021) Lancet, Respiratory Medicine, SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study

Prospective cohort of US Marines.

Seropositive young adults were 82% protected against reinfection

Adnan et al (2021) Clinical Infectious Diseases, Reinfection With Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) in Patients Undergoing Serial Laboratory Testing

N = 9,119, serial tests

Reinfection rates, 0.7%


Risk of repeat SARS-CoV-2 infection decreased by 80·5–100% among those who had had COVID-19

Protection from reinfection is strong and persists for more than 10 months of follow-up, (Hansen et al 2021 Lancet)

Turner, et al Nature, SARS-CoV-2 infection induces long-lived bone marrow plasma cells in humans

Madhuumita et al, Plos One, T cell response to SARS-CoV-2 infection in humans: A systematic review

SARS-CoV-2 infection induces specific and durable T-cell immunity,

Nina et al, (2020) Nature, SARS-CoV-2-specific T cell immunity in cases of COVID-19 and SARS, and uninfected controls

Memory B-cell response to SARS-CoV-2 evolves between 1·3 and 6·2 months after infection, which is consistent with longer-term protection

Some people who have recovered from COVID-19 might not benefit from COVID-19 vaccination

One study found that previous COVID-19 was associated with increased adverse events following vaccination with Pfizer

In Switzerland, proof of recovered infection, in the past 12 months are considered equally protected as fully vaccinated,

Thank you, John!



I attempted to find a graphic of natural immunity but Google wouldn’t let me.  While not shocking, this is quite telling as natural immunity has been acknowledged from the beginning of time but is being downplayed, ignored, and frankly rewritten as only coming from “vaccines.”  This is intentional and you need to be aware of it.

This article explains how natural immunity to coronavirus lasts a year and perhaps a life-time, and that cells that retain a memory of the virus persist in the bone marrow and may churn out antibodies whenever needed. Natural immunity is long lasting, robust, and better than vaccinesFurther, effective treatments makes the need for a vaccine null and void, which of course is why they are ridiculing and attacking doctors who are educating others about these treatments.

  • Recently a Johns Hopkins professors states to “ignore the CDC” due to their refusal to recognize natural immunity from previous infection. The WHO also recently changed the definition of herd immunity to now only come from vaccines, essentially rewriting hundreds of years of scientific understanding.
  • There is ample evidence that those who have already had COVID should NOT get “vaccinated.” Dr. Hooman Noorchashm has repeatedly warned the FDA that “clear and present danger” exists for those who have had COVID-19 and subsequently get vaccinated due to viral antigens that remain in the body after a person is naturally infected; the immune response reactivated by the COVID-19 vaccine may trigger inflammation in tissues where the viral antigens exist. An international survey of 2,002 people found that people who had previously had COVID-19 experienced “significantly increased incidence and severity” of side effects after the COVID-19 vaccine
  • It’s important to remember that COVID injections are part of a grand experiment where final data is unknown. These are experimental, fast-tracked injections that do not stop transmission or infection and have not undergone rigorous testing, have already proven to be the most dangerous injections in the history of VAERS.
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