Research by South African scientists have suggested that the Omicron COVID-19 variant could displace the Delta variant, because infection with the new variant boosts immunity to the older one.

According to Reuters, the study only covered a small group of people and had not been peer-reviewed, but it found that people who were infected with Omicron, especially those who were vaccinated, developed enhanced immunity to the Delta variant.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 neutralisation 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 neutralises Delta making re-infection with Delta less likely,

they said.

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,

the report

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 was 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.

Justin Nwosu

Justin Nwosu is the founder and publisher of Flavision. His core interest is in writing unbiased news about Nigeria in particular and Africa in general. He’s a strong adherent of investigative journalism, with a bent on exposing corruption, abuse of power and societal ills.