South Africa study suggests Omicron could displace Delta

Passengers queue to get a PCR test against the coronavirus disease (COVID-19) before traveling on international flights, at O.R. Tambo International Airport in Johannesburg, South Africa, November 26, 2021. REUTERS/Sumaya Hisham

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The study only covered a small group of people and has not been peer-reviewed, but it found that people who were infected with Omicron, especially those who were vaccinated, developed enhanced immunity to the Delta variant.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

A healthcare worker collects a swab from Bronwen Cook for a PCR test against the coronavirus disease (COVID-19) before traveling to London, at O.R. Tambo International Airport in Johannesburg, South Africa, November 26, 2021. REUTERS/ Sumaya Hisham

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]

Visitors are seen in the popular Waterfront district, as numbers of international tourists decline following recent coronavirus disease (COVID-19) travel restrictions, in Cape Town, South Africa, December 5, 2021. REUTERS/Mike Hutchings

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 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.

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

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.

(Reporting by Juby Babu in Bengaluru; Editing by Susan Fenton)