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People who had previously been infected with COVID-19 were better protected against the Delta variant than those who were vaccinated alone, suggesting that natural immunity was a more potent shield than vaccines against that variant, California and New York health officials reported on Wednesday.
A study by the Centers for Disease Control and Prevention released on Wednesday shows that those who have recovered from COVID-19 have more protection against infection than those who have only been vaccinated.
Researchers reviewed data from California and New York from May to November, when the delta variant was dominant in the U.S.
The study looked at four groups of people: unvaccinated with no prior COVID-19 infection, vaccinated with no prior infection, unvaccinated who recovered from COVID-19, and vaccinated who recovered.
Natural immunity that develops after SARS-CoV-2 infection offers considerably better protection against the "Delta variant" than does two doses of the Pfizer-BioNTech vaccine, an Israeli study found.
The study relies on data from Israel's Maccabi Health Services, and was conducted by researchers from Maccabi and Tel Aviv University. A preprint of the study, which has not yet been peer-reviewed, was published last week on medRxiv.
According to Science Magazine, the study found that "never-infected people who were vaccinated in January and February were, in June, July, and the first half of August, six to 13 times more likely to get infected than unvaccinated people who were previously infected with the coronavirus."
Further, "the risk of developing symptomatic COVID-19 was 27 times higher among the vaccinated, and the risk of hospitalization eight times higher."
"This analysis demonstrated that natural immunity affords longer lasting and stronger protection against infection, symptomatic disease and hospitalization due to the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity," the authors wrote.
The point of the story is that when the Alpha variant was dominant, vaccination was quite a bit more effective than natural immunity; I speculate that that's because the vaccines were developed from the Alpha variant.
originally posted by: OccamsRazor04
a reply to: Madviking
The vaccines worked extremely well for the virus they were developed for. If you notice, Delta is the variant in the article, which is not the original virus the vaccine was developed for.
originally posted by: ketsuko
We can go even deeper. Depending on how your vaccine is made, the immunity produced will vary in effectiveness too. Vaccines made with whole virus will produce a better immune response than those made with only partial virus. So it stands to reason that the COVIS vax would not necessarily be great.
New CDC study states natural immunity was superior to vaccines for protection from Delta
Protection against Delta was highest, however, among people who were both vaccinated and had survived a previous COVID infection