November 30, 2022


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The study found a three-fold risk of re-infection with the Omigran variant

The work is based on an analysis of 35,670 re-infections identified in nearly 2.8 million people tested positive in South Africa.

Between November 1 and November 27, the risk of re-infection was three times higher compared to waves associated with beta and delta variations.

The study concludes that “the Omicron variant is associated with a significant ability to prevent immunity from previous infections”, which was available on the medRxiv pre-release site on Thursday, but has not yet been verified by colleagues.

“We have no data on the vaccine status of individuals in our data, so we can not make any conclusions about Omigran’s ability to avoid vaccine – induced immunity,” Juliette Bulliam of Stellenbosch University in South Africa warned on Twitter. Study.

Last week, South Africa announced the discovery of this new variant, which created the phenomenon of global panic.

Because it has so many mutations, scientists have tried to understand whether it can be highly contagious or resistant to vaccines or immunity acquired due to a previous infection.

Laboratory results are still awaited, so this study provides valuable first information.

“We hope the previous infection did not protect against Omigran,” said Anne von Godberg, an epidemiologist with the South African National Infectious Diseases (NICD).

According to first observations, already infected people may be re-contaminated by Omicron, often with less severe symptoms, the scientist noted.

However, vaccines should be effective against severe forms of the disease, he said.

The current variation is found in at least 22 countries, according to the WHO, in four African countries: Ghana, Nigeria, Botswana and South Africa.

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