Previous COVID-19 infection does not protect as well as reinfection vaccine: CDC – .

Previous COVID-19 infection does not protect as well as reinfection vaccine: CDC – .

Patients hospitalized with COVID-like symptoms were five times more likely to test positive for Sars-Cov-2, if they were not vaccinated and had a history of COVID-19, compared to those who received the Moderna or Pfizer vaccine and had no history of coronavirus infection, according to a report released last week by the CDC.

CDC researchers looked at data collected from more than 7,000 hospitalized adults, aged 18 and older, who had symptoms associated with COVID-19, at 187 hospitals across nine states. The researchers compared the early protection against COVID-19 developed from a previous SARS-CoV-2 infection with that developed from COVID-19 mRNA vaccines. The healthcare organization used VISION Network which collected the data during the period January to September 2021. The CDC then analyzed the data to compare the odds of testing positive for SARS-CoV-2 between the non-group. vaccinated who had prior COVID infections at least 90-179 days prior to hospitalization with those who were fully vaccinated 90-179 days prior to recent hospitalization and had no history of illness.

The researchers found that among unvaccinated adults who had coronavirus at least 3 months before the new hospital admission, 8.7% tested positive for the coronavirus again. Meanwhile, a smaller percentage of those who were fully vaccinated with the mRNA vaccine (Pfizer or Moderna) and had no previous infections, 5.1%, tested positive for COVID-19, according to the weekly report. on morbidity and mortality on the CDC website.

Atlanta, Georgia, USA – August 28, 2011: Entrance sign for the Centers for Disease Control and Prevention. Sign located near the 1700 block of Clifton Road in Atlanta, Georgia on the Emory University campus. Vertical composition. (iStock)


The report said that “vaccine-induced immunity was more protective than immunity induced by laboratory-confirmed COVID-19 infection.”

The study also noted that secondary analyzes that did not adjust for time for previous infection or vaccination as well as before and during the predominance of the delta variant produced similar results. The results coincide with previous studies that found vaccine immunity to be stronger than infection-induced immunity with respect to the occurrence of COVID reinfection.

FILE – In this October 5, 2021 file photo, a healthcare worker fills a syringe with Pfizer COVID-19 vaccine at Jackson Memorial Hospital in Miami. President Joe Biden’s most aggressive move to tackle the COVID-19 pandemic is almost ready to see the light of day. The government is set to release details of a new vaccination or testing rule covering more than 80 million Americans in companies with 100 or more workers. (AP Photo / Lynne Sladky, file)

“These results are consistent with the evidence that neutralizing antibody titers after receiving 2 doses of COVID-19 mRNA vaccine are high,” the authors said in the CDC report.

The results differ from an unpaired retrospective study in Israel, which found no higher protection in vaccinated adults compared to those who had previously been infected with COVID during the predominance of the Delta variant.

The agency stressed that providers should be aware of an increase in anxiety-related events soon after the J&J vaccine compared to flu shots, and observe all COVID-19 vaccine recipients for 15 minutes. after. (iStock)


The CDC authors noted that the Israeli study evaluated any positive SARS-CoV-2 test, where this particular study looked at laboratory-confirmed COVID-19 molecular tests. The authors also said that the Israeli report only looked at vaccinations received 6 months previously, so the benefits of recent vaccination were not taken into account.


“This report has focused on early protection against infection-induced immunity and vaccination, although the estimates may be affected by time. The report discussed the importance of further studies to better understand vaccine-induced and infection-induced immunity against COVID 19.

The authors of the CDC report concluded: “All eligible people should be vaccinated against COVID-19 as soon as possible, including unvaccinated people previously infected with SARS-CoV-2. “

American Infectious Diseases Society spokesperson Dr. Aaron Glatt was not associated with the study, but told Fox News that there is still a lot we don’t know about COVID-19. The epidemiologist also told Fox News: “The body of evidence is growing, including this article, to support the idea that vaccination provides better overall immunity than natural immunity against COVID infection. We look forward to additional evidence that may provide us with even more specific recommendations, as to when is the optimal time to vaccinate a post-COVID infection. “


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