Large study shows natural immunity 13x more effective than shot on breakthrough cases
Another study found 'no significant difference' in viral load for vaccinated vs. unvaccinated
A new study conducted with a large sample in Israel has found that natural immunity may be up to 13 times more effective than COVID-19 vaccines.
Additionally, the results seem to indicate vaccinated persons are 27 times more at risk of catching and developing symptomatic COVID-19 compared to those who have natural antibodies after recovering from COVID-19.
The study utilized information from the database of Maccabi Healthcare Services (MHS), Israel’s second-largest Health Maintenance Organization.
According to the documentation for the study, “MHS is a 2.5-million-member, state-mandated, non-for-profit” that covers 26% of the population. MHS provides a “representative sample of the Israeli population.”
The study was published by MedRx and is titled “Comparing SARS-CoV-2 natural immunity to vaccine-induced immunity: reinfections versus breakthrough infections.”
“This study demonstrated that natural immunity confers longer lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity,” the study’s conclusion reads.
The study also concluded that “individuals who were both previously infected with SARS-CoV-2 and given a single dose of the vaccine gained additional protection against the Delta.”
The summary of the results showed that those who were vaccinated had a “13.06-fold (95% CI, 8.08 to 21.11) increased risk for breakthrough infection with the Delta variant compared to those previously infected, when the first event (infection or vaccination) occurred during January and February of 2021.”
The study says that the increased risk was also “significant” for symptomatic disease.
“When allowing the infection to occur at any time before vaccination (from March 2020 to February 2021), evidence of waning natural immunity was demonstrated,” the study says, with "SARS-CoV-2 naïve vaccinees having a “5.96-fold increased risk” for breakthrough infection and a “7.13-fold increased risk” for symptomatic disease.
The study also indicated that those who were vaccinated were also “at a greater risk for COVID-19-related-hospitalizations compared to those that were previously infected.”
The full study can be accessed on the MedRx website. It is not yet peer-reviewed.
Another study published by MedRx found “no significant difference in cycle threshold values between vaccinated and unvaccinated, asymptomatic and symptomatic groups infected with SARS-CoV-2 Delta.”
The data for the study on viral load were collected from people who voluntarily sought testing COVID from “two demographically distinct populations in California” from June 17 to August 31, 2021. The study notes that time period was when “Delta was the predominant variant” in California.
On Oct. 1, Democratic Governor Gavin Newsome announced that as a requirement for attending public school in the state he would be mandating all K-12 students get a COVID-19 vaccination once the shots were approved by all government entities.
Newsome recently survived a recall attempt brought on in part by his COVID-19 restrictions.
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