Omicron Has A Lower Fatality Rate In South Africa - Virologist

1 year ago
Thu, 30 Dec 2021 07:41:40 GMT
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Omicron Has A Lower Fatality Rate In South Africa - Virologist

A virologist has claimed that Omicron, a new coronavirus variant first detected in South Africa at the end of November this year, has a lower fatality rate in South Africa because most people there have immunity.

Ben Krishna, a Postdoctoral Researcher, Immunology and Virology, University of Cambridge, says after infection with any virus, the immune system adapts by making antibodies that stick to the virus to neutralise it, and killer T-cells that destroy infected cells.

Antibodies are pieces of protein that stick to the specific molecular shape of the virus, and killer T-cells recognise infected cells via molecular shape as well. Added Krishna:

SARS-CoV-2 can therefore evade the immune system by mutating sufficiently that its molecular shape changes beyond the immune system’s recognition.

This is why Omicron is so apparently successful at infecting people with previous immunity, either from vaccines or infections with other variants — the mutations that allow the spike to bind to ACE2 more strongly also reduce the ability of antibodies to bind to the virus and neutralise it.

Pfizer’s data suggests that T-cells should respond similarly to Omicron as to previous variants, which aligns with the observation that Omicron has a lower fatality rate in South Africa, where most people have immunity.

Importantly for humanity, past exposure still seems to protect against severe disease and death, leaving us with a “compromise” where the virus can replicate and reinfect, but we do not get as severely sick as the first time.

Krishna added that “we might have COVID-19 season each winter in the same way we have flu season now.” Added the virologist:

Influenza viruses can also have a similar pattern of mutation over time, known as “antigenic drift”, leading to reinfections.

Each year’s new flu viruses are not necessarily better than last year’s, just sufficiently different.

Perhaps the best evidence for this eventuality for SARS-CoV-2 is that 229E, a coronavirus that causes the common cold, does this already.

Krishna concludes that Omicron will, therefore, not be the final variant, but it may be the final variant of concern.

More: The Herald



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