The study was rigorous and had strong points: since it was a hospital institution, testing was strongly encouraged among staff at the slightest suspicion - even to excuse them from work. Therefore, case detection was tightly controlled.
Until then, we already knew that effectiveness against Covid-19 infection was low and waned rapidly, and we still didn't know for sure whether it reduced transmission at all. With this study, we learned that effectiveness didn't just keep falling - it actually became negative. In other words, it increased the chance of getting infected, doing exactly the opposite of what a vaccine is supposed to do.
"The greater the number of vaccine doses previously received the higher the risk of Covid-19," the Cleveland Clinic scientists wrote.
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In short, the now-consolidated information is: any reduction in infection risk is transient, drops rapidly, damages the immune system, and eventually becomes negative.
It went very wrong.
Convenient forgetting
From the start of the pandemic until today, we've gone through more than five years, almost six. It was one of the biggest disruptions to everyday life in history. At the same time, no one talks about the subject in the media, leaving it off the agenda for conversation circles or get-togethers with friends.
There is, implicit in this, a strong interest in making the whole of society forget the matter and look forward, to other things.
If we were talking about recent history, all of society would have to confront a systematic review published in 2025 in Health Affairs Scholar. This study analyzed 132 other studies on lockdowns in the US and pointed to a public health disaster: harmful effects in more than 90% of indicators of mental health, obesity, and health-related social needs (child development, employment, access to food, economic stability). But it served to save lives, right? They found no evidence of that: "little or no effect on Covid-19 mortality," the scientists wrote.
If the subject were still of interest, everyone would be following a Taiwanese study with nearly 3 million participants, published in 2025 in the International Journal of Medical Sciences. This study compared vaccinated and unvaccinated individuals and found, among the Covid-19 vaccinated, an 84% increase in the risk of needing dialysis after one year of follow-up, even after adjustments for age, comorbidities, and other renal risk factors. Almost double.
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After so many governments forcing the product on people, with support from the media, entities, universities, and corporations, it's really better not to highlight the Italian study covering the entire population of a province (296,015 people). With 30 months of follow-up, the study found, in the comparison between Covid-19 vaccinated and unvaccinated, a 54% increase in the risk of hospitalization for breast cancer among vaccinated women, plus increases in colorectal cancer (34%) in vaccinated and bladder (62%), also in vaccinated.
These findings were later confirmed by a Korean study with 8.4 million participants that found similar patterns in six types of cancer, also comparing vaccinated and unvaccinated: prostate (69% higher risk), lung (53%), thyroid (35%), gastric (34%), colorectal (28%), and breast (20%), with risks varying by age, sex, and vaccine type.
If the pandemic were still on the agenda, we'd have to talk about the Japanese study that saw accelerated progression of pancreatic cancer among vaccinated, compared to unvaccinated, confirming the data from Korea and Italy.