However, they are not meaningful unless compared to an un-vaccinated control group.
For instance, the Covid fatality rate in South Africa has dropped 80% since Omicron became the dominant variant.
But, just 30% of South Africans are vaccinated.
as SA has said before, widespread prior infection and so it’s possible there’s residual immunity at work reducing hospitalizations. That’s where T-cells factor in, as opposed to spot-antibody counts. Coupled with a SA median age of 26. They’ve still had a few deaths, tho, and people are hospitalized, but less demand for high flow O2. According to the DM, death rate is currently at 4.5% from 22%. But again, youth/agefactor is stressed.
https://www.dailymail.co.uk/news/article-10353237/Death-rates-SAs-Omicron-Covid-wave-just-QUARTER-levels-seen-previous-surges.html