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Originally Posted by golfing eagles
And your education, experience, and clinical acumen for that degree of confidence is.......???????
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https://www.medrxiv.org/content/10.1...114v1.full.pdf
Abstract
BACKGROUND
Infection with SARS-CoV-2 provides substantial natural immunity against reinfection. Recent studies have shown strong waning of the immunity provided by the BNT162b2 vaccine. The time course of natural and hybrid immunity is unknown.
METHODS
Data on confirmed SARS-CoV-2 infections were extracted from the Israeli Ministry of Health database for the period August to September 2021 regarding all persons previously infected or vaccinated. We compared infection rates as a function of time since the last immunity-conferring event using Poisson regression, adjusting for possible confounding factors.
RESULTS
Confirmed infection rates increased according to time elapsed since the last immunity-conferring event in all cohorts. For unvaccinated previously infected individuals they increased from 10.5 per 100,000 risk-days for those previously infected 4-6 months ago to 30.2 for those previously infected over a year ago. For individuals receiving a single dose following prior infection they increased from 3.7 per 100,000 person days among those vaccinated in the past two months to 11.6 for those vaccinated over 6 months ago. For vaccinated previously uninfected individuals the rate per 100,000 person days increased from 21.1 for persons vaccinated within the first two months to 88.9 for those vaccinated more than 6 months ago.
CONCLUSIONS
Protection from reinfection decreases with time since previous infection, but is, nevertheless, higher than that conferred by vaccination with two doses at a similar time since the last immunity-conferring event. A single vaccine dose after infection helps to restore protection
Duration of SARS-CoV-2 Natural Immunity and Protection against the Delta Variant: A Retrospective Cohort Study - PubMed
Conclusions: SARS-CoV-2 infection is highly protective against reinfection with the Delta variant. Immunity from prior infection lasts for at least 13 months. Countries facing vaccine shortages should consider delaying vaccinations for previously infected patients to increase access.
Necessity of COVID-19 vaccination in previously infected individuals | medRxiv
Summary Cumulative incidence of COVID-19 was examined among 52238 employees in an American healthcare system. COVID-19 did not occur in anyone over the five months of the study among 2579 individuals previously infected with COVID-19, including 1359 who did not take the vaccine.
https://www.nejm.org/doi/full/10.1056/NEJMc2110300
Protection by previous SARS-CoV-2 infection against reinfection with the beta variant was observed, even 1 year after the primary infection, but protection was slightly lower than that against the alpha variant and wild-type virus circulating in Qatar.3-5 These findings give some insights into the hypothesis that natural immunity may provide protection against known variants of concern.
Omicron Scare: Is WHO Ignoring Natural Immunity To Promote Covid-19 Vaccines?
"Real world population studies from Israel after the rollout of vaccination has established that such naturally acquired immunity is 13 times more robust than that induced by vaccines. Translating this in practice one can say that a person who has recovered from a natural infection has already received 13 boosters! Why can’t the WHO see this and include it into its advisories?” Banerjee said.
He added, “Stands to common sense, even if we ignore the science, which is all too frequent in this pandemic. One who catches the infection harbours the whole virus for roughly 13 days in the body. Vaccine tries to mimic this by injecting a dose of attenuated part of the virus or with newly developed technology gene-based vaccine which stimulates the body to produce only part of the viral component – the spike protein. A double injection of the vaccine and a booster makes three, not thirteen!”
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"It looks WHO is confused. On one side they are saying both vaccine and natural immunity provides equal protection, on the other, they are not ready to agree to consider those who recovered from infection as already immunized. In fact, real study data indicates natural infection elicits far better immune responses and protection,” Prof Das said.
https://techstartups.com/2021/12/14/...ural-immunity/