Ops: Omicron infects more vaccinated than unvaccinated

A Danish team of researchers has found that the Omicron variant evades the immunity of vaccinated individuals at a much faster rate than Delta and at a higher rate than unvaccinated, according to the study conducted by researchers at the University of Copenhagen.

" Comparing families infected with Omicron to Delta VOC (VOC, relevant variant) we found a SAR (Secondary attack rate, infectivity rate) 1.17 times higher for the unvaccinated, 2.61 times higher for fully vaccinated subjects and 3.66 times higher for booster vaccinated individuals, demonstrating strong evidence of immune evasion of the Omicron VOC , ”he said. the pre-edition of the study.

However, the study also found that unvaccinated individuals shed the virus more easily than those who are fully vaccinated, while transmission was reduced among people who received booster shots.

There were a total of 11,937 families involved in the study, of which 2,225 already had Omicron. After one to 7 days, the team followed up with the families and found 6,397 secondary infections. The SAR was found to be 31 percent with the Micron and 21 percent with the Delta variant.

Omicron has spread to 90 countries around the world and has become the dominant variant in the United States. However, the strain has been shown to cause mild symptoms compared to previous variants such as Delta and results in fewer hospitalizations.

" The Micron VOC (relevant variant) has been reported to be three to six times more infectious than previous variants, with a short doubling time, including early estimates from countries with high vaccination coverage indicating doubling times of 1.8 days (UK), 1.6 days (Denmark), 2.4 days (Scotland) and 2.0 days (US) ” from the study.

The researchers also suggested considering alternative methods of fighting the infection. " Our data indicate that non-pharmaceutical interventions used to control previous variants of SARS-CoV-2 are likely to be effective against the Omicron VOC as well ."

Seventy-eight percent of Danish citizens are fully vaccinated with two doses, while nearly half have received a booster vaccination. Over 80% received Pfizer-BioNTech's vaccine.

The effectiveness of vaccines is reduced to about 40% for symptoms and 80% for severe diseases with the Omicron variant. The numbers were better with the booster as effectiveness was only reduced to 86 percent for symptoms and 98 percent for those suffering from severe infections, respectively.

The effectiveness of vaccination with Pfizer-Biotech for preventing infection with the Omicron variant is only 35 percent, according to the study. " The advantage of the VOC Micron appears to be a combination of high transmissibility and increased immune avoidance capabilities ."

"We therefore suggest that adapted or improved vaccines may be needed to mitigate the spread of the Micron VOC ."

The Danish team added that further studies are needed to understand the latest variant of COVID-19, as they concluded: “ Our results confirm that booster vaccination has the potential to reduce Omicron VOC transmission in families, although the vaccination as a strategy for controlling the epidemic is increasingly challenged by the immune evasiveness of the VOC Micron. "

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The article Ops: Omicron infects more vaccinated than unvaccinated comes from ScenariEconomici.it .

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This is a machine translation of a post published on Scenari Economici at the URL https://scenarieconomici.it/ops-omicron-infetta-piu-i-vaccinati-che-i-non-vaccinati/ on Thu, 06 Jan 2022 17:37:00 +0000.