Omicron has Immune AvoidanceCanoe wrote: ↑Wed Jan 12, 2022 9:26 am... Note on those un-vaccinated who think they're 'protected' by a prior infection: while there is still a decent antibody count, the effective antibodies that actually rally an immune response wane significantly by three months, and is negligible by six months. This was with variants prior to Omicron.
I've not seen anything on that with Omicron. Nor on if an infection of a variant prior to Omicron has any benefit regarding Omicron (nor on a prior Omicron infection for a new Omicron infection). ...
Limited benefit from a prior pre-Omicron Covid-19 infection or a prior Omicron infection.
Can be infected or re-infected by Omicron.
https://www.yahoo.com/lifestyle/omicron ... 00558.html
- “We’ve had a number of well-documented second infections with COVID,” ... “... there’s no reason to think that Omicron in this regard is any different than the previous variants.”
- “Just as we have seen over the course of the pandemic, one infection does not necessarily protect from a further infection,”
- Omicron also has a large number of mutations—including at least 34 on its spike protein, which is what the virus uses to latch onto your cells—and “it’s so very contagious,” Dr. Schaffner says. “People shed so much virus with Omicron. As with other infections, sometimes immunity can be swamped if the exposure is very intense,"
- recent research from the Imperial College London found that the risk of reinfection with Omicron is 5.4 times higher than it was with Delta, the previous dominant COVID-19 strain.
[edit: 6.36 times higher for unvaccinated, 5.02 times for vaccinated]Omicron was associated with a 5.41 (95% CI: 4.87-6.00) fold higher relative risk of reinfection compared with Delta. The relative risks were 6.36 (95% CI: 5.23-7.74) and 5.02 (95% CI: 4.47-5.67) when estimated separately for unvaccinated and vaccinated cases, respectively.- Researchers specifically found that protection against reinfection by Omicron from a past COVID-19 infection could be as low as 19%.
- “One of the key features of Omicron is that it’s much more resistant to immunity, whether vaccine-induced or caused by previous infection,”
- “Yes, you can get Omicron twice,” ... “Omicron is highly contagious and it would appear to not induce fantastic protective immunity,”
https://doi.org/10.25561/93038 https://www.imperial.ac.uk/media/imperi ... ort-49.pdf