South Africa study suggests Omicron could displace Delta By Reuters

© Reuters. FILE PHOTO: A healthcare worker administers a dose of the Pfizer coronavirus disease (COVID-19) vaccine to a teenager, amidst the spread of the SARS-CoV-2 variant Omicron, in Johannesburg, South Africa, December 9, 2021. REUTERS/ Sumaya Hisham

(Reuters) -Research by South African scientists suggests that Omicron could displace the Delta variant of the coronavirus because infection with the new variant boosts immunity to the older one.

The study only covered a small group of people and has not been peer-reviewed, but it found that people who were infected with Omicron, especially those who were vaccinated, developed enhanced immunity to the Delta variant.

The analysis enrolled 33 vaccinated and unvaccinated people who were infected with the Omicron variant in South Africa.

While the authors found that neutralisation of Omicron increased 14-fold over 14 days after the enrolment, they also found that there was a 4.4-fold increase in neutralisation of the Delta variant.

"The increase in Delta variant neutralization in individuals infected with Omicron may result in decreased ability of Delta to re-infect those individuals," the scientists who conducted the study said.

The results of the study are "consistent with Omicron displacing the Delta variant, since it can elicit immunity which neutralizes Delta making re-infection with Delta less likely," they said. [https://secureservercdn.net/50.62.198.70/1mx.c5c.myftpupload.com/wp-content/uploads/2021/12/MEDRXIV-2021-268439v1-Sigal.pdf]

According to the scientists, implications of this displacement would depend on whether or not Omicron is less pathogenic compared to Delta. "If so, then the incidence of COVID-19 severe disease would be reduced and the infection may shift to become less disruptive to individuals and society."

Alex Sigal, a professor at the Africa Health Research Institute in South Africa, said on Twitter (NYSE:TWTR) on Monday that if Omicron was less pathogenic as it looked to be from the South African experience, "this will help push Delta out".

According to an earlier South African study, there is reduced risk of hospitalisation and severe disease in people infected with Omicron compared with the Delta variant, though the authors say some of that is likely due to high population immunity.

The Omicron variant, first detected in southern Africa and Hong Kong in November, has since spread worldwide and threatened to overwhelm hospitals in some countries.

Statement: The content of this article does not represent the views of FTI website. The content is for reference only and does not constitute investment suggestions. Investment is risky, so you should be careful in your choice! If it involves content, copyright and other issues, please contact us and we will make adjustments at the first time!