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Science: Immune boosting by B.1.1.529 (Omicron) depends on previous SARS-CoV-2 exposure
https://flutrackers.com/forum/forum...icron-depends-on-previous-sars-cov-2-exposure
Where’s the herd immunity? Our research shows why Covid is still wreaking havoc
Danny Altmann
‘Living with the virus’ is proving much harder than the early vaccine success suggested: this fight is far from over
Danny Altmann is a professor of immunology at Imperial College London
Fri 1 Jul 2022 07.43 EDT
We are all so very tired of Covid-19, and there are many other crises to wrestle with. This pandemic has been going on since the beginning of 2020, and a state of hypervigilance can only be maintained for so long. And yet, “just live with it” looks self-evidently too thin a recipe and, currently, not very workable or successful with the emergence of BA.4 and BA.5 Omicron subvariants.
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Rather than a wall of immunity arising from vaccinations and previous infections, we are seeing wave after wave of new cases and a rapidly growing burden of long-term disease. What’s going on? The latest scientific research has some answers.
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Last week a group of collaborators, including me and a professor of immunology and respiratory medicine, Rosemary Boyton, published a paper in Science, looking comprehensively at immunity to the Omicron family, both in triple-vaccinated people and also in those who then suffered breakthrough infections during the Omicron wave. This lets us examine whether Omicron was, as some hoped, a benign natural booster of our Covid immunity. It turns out that isn’t the case.
We considered many facets of immunity, including the antibodies most implicated in protection (“neutralising antibodies”), as well as protective “immune memory” in white blood cells. The results tell us it is unsurprising that breakthrough infections were so common. Most people – even when triple-vaccinated – had 20 times less neutralising antibody response against Omicron than against the initial “Wuhan” strain. Importantly, Omicron infection was a poor booster of immunity to further Omicron infections. It is a kind of stealth virus that gets in under the radar without doing too much to alert immune defences. Even having had Omicron, we’re not well protected from further infections.
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Contrary to the myth that we are sliding into a comfortable evolutionary relationship with a common-cold-like, friendly virus, this is more like being trapped on a rollercoaster in a horror film. There’s nothing cold-like or friendly about a large part of the workforce needing significant absences from work, feeling awful and sometimes getting reinfected over and over again, just weeks apart. And that’s before the risk of long Covid.
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The first generation of vaccines served brilliantly to dig us out of the hole of the first year, but the arms race of boosters versus new variants is no longer going well for us. The UK has only offered a limited group fourth doses, and even then, uptake looks poor. Even if we had good vaccination coverage, we have entered a period of diminishing returns. A study reported in the BMJ last week showed us that the protection gained from a fourth booster dose likely wanes even faster than previous boosters. This leaves us between a rock and a hard place: continue to offer suboptimal boosters to a population who seem to have lost faith or interest in taking them up, or do nothing and cross our fingers that residual immunity might somehow keep a lid on hospitalisations (as happened in South Africa and Portugal).
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https://www.theguardian.com/commentisfree/2022/jul/01/herd-immunity-covid-virus-vaccine