Kaiser Permanente is both an insurance company and a healthcare provider company.
Here is an important Kaiser preprint. On page 30, you can see a key following table, which shows how well 3 shots worked for over 120,000 Kaiser enrollees who were tested for COVID during Omicron. Kaiser did something unusual: it actually sequenced 16,418 positive COVID samples to determine the Omicron subvariant with which the enrollees were infected.
What it found was that for 4 out of 5 Omicron subvariants by 150 days (5 months) post shot, efficacy had fallen into negative territory, and Kaiser’s thrice-vaccinated enrollees were more likely to get COVID than the unvaccinated.
When it comes to COVID vaccines it is imperative to think in terms of risks versus benefits. Even with positive vaccine efficiency there is the risk of harmful health impacts and death.
I proved all three vaccines used in the US have negative efficacy. I used their own FDA submissions published in the NEJM, and used the correct endpoint for all morbidity and mortality. The results are appalling! Using grade 3 and 4 plus deaths as the endpoint Moderna's efficacy is -322.59%, 1 harmed for every 5 vaccinated. Pfizer efficacy -52.38% with 1 harmed for every 241 vaccines administered. J&J efficacy -80.32% with 1 harmed for every 74 vaccines administered. This analysis was done October, 2021.
I recall that the released Pfizer documents revealed investigator bias.
The participants in the vaccinated group who exhibited covid-like symptoms were simply not tested for covid and dismissed as non-covid illness, thus reducing the case count among the vaccinated.
Also vaccination status in the official medical records is not always accurate. They are biased to record the infected as "unvaxxed" if they are somewhere in the process of being vaccinated, or if there vaccination status is unknown. So the calculations could be based on inaccurate data to begin with! Garbage In, Garbage Out!!