Anyone can say anything. That doesn't mean any explanation is equally likely. Instead of believing the author and the scientific explanations which explain how a biased selection with skewed sample sizes could lead for that result, you decide to go with the totally biologically implausible conspiracy theory that vaccines cause negative efficacy. Christ.
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The specific point being cited online to suggest the vaccines are harmful concerns the study’s finding that, after 90 days, the vaccine effectiveness against infection with omicron was calculated to be below zero — which would suggest in theory that it increases chances of contracting the virus.
However, the study explains that “the negative estimates in the final period arguably suggest different behaviour and/or exposure patterns in the vaccinated and unvaccinated cohorts causing underestimation” of vaccine effectiveness.
Hansen said there are a “number of reasons” why the estimate might be negative, noting that biases are “quite common” in calculating effectiveness with observational studies. In other words, other factors are causing the vaccine to appear less effective.
The underestimates could be the product of vaccinated individuals being tested more frequently, therefore resulting in a higher incidence rate, he said. Also, behavioral differences, such as vaccinated individuals engaging in more activities that could lead to exposure, could be at play, he said.
Natalie Dean, an assistant professor of biostatistics at Emory University whose research includes methods for evaluating vaccine efficacy, said in an email that while the vaccines are less effective against infection with omicron, there is no real-world evidence that scientists are aware of that would explain the vaccines’ effectiveness actually being below zero.
Instead, she agreed that the negative results in the study were “highly likely to be due to bias in the data.”
As an example, she said, high vaccination rates mean that the “pool of people who are unvaccinated is comparatively small and may be fundamentally different in terms of risk or testing behavior.” More than
78% of people in Demark are fully vaccinated against COVID-19.
Jeffrey Morris, director of the division of biostatistics at the University of Pennsylvania’s Perelman School of Medicine, shared similar observations. He said in an email that the results were “more likely to be an artifact of some selection bias effect than any inherently higher risk"