And now there is talk of a placebo, or rather a placebo effect, in vaccine tests. Because even those who received a placebo in anti-Covid vaccine tests reported side effects. More than two-thirds of common adverse events associated with the Covid vaccine can be attributed to the “nocebo” effect, the negative version of the placebo effect. This is the indication provided by Harvard Medical School scientists who in the United States analyzed data on 12 clinical trials of Covid vaccines. The researchers found, according to The Guardian, that the nocebo effect was responsible for 76% of the common adverse reactions reported after the first dose and nearly 52% after the second dose.
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