Covid, vaccine and nocebo effect: those to whom fear causes undesirable effects

Due to the nocebo effect, as opposed to the better known placebo, skeptics are more likely to trigger adverse reactions from the anti-Covid vaccination, with interesting differences between men and women. Fearing the adverse reactions of a vaccine against Covid could favor, after receiving it, the appearance of fever, chills, malaise, tiredness or other common side effects, the more intense the greater the pre-existing reserves.