butters
High on a Hill
- Joined
- Jul 2, 2009
- Posts
- 85,660
https://www.msn.com/en-us/health/me...t-phenomenon/ar-AAT0Va7?ocid=msedgdhp&pc=U531
in otherwords, the more likely you are to expect to feel adverse reactions, the more likely you are.
in otherwords, the more likely you are to expect to feel adverse reactions, the more likely you are.
How Researchers Conducted This Study
Researchers from Harvard Medical School and Beth Israel Deaconess Medical Center compared the rates of adverse reactions reported by people who received the vaccine versus those who received a placebo. They reviewed 12 clinical trials for different types of COVID vaccines - looking at 22,802 vaccine recipient and 22,578 placebo recipient reports - and found that the nocebo effect accounted for 76 percent of common systemic reactions (those not experienced at the local injection site) following the first vaccine dose and almost 52 percent following the second.
Though the researchers did find that more vaccine recipients reported adverse reactions, about a third of placebo recipients reported at least one adverse reaction after either dose. Headache and fatigue were the most common reactions reported by this placebo group. It's worth noting, too, that adverse reactions dipped for the placebo group after the second dose and increased for the vaccine group.
According to an article published on the Harvard Medical School website, some of the adverse effects experienced by the vaccine group can also be attributed to the nocebo effect, "given that many of these events also occurred in the placebo group."