The last round of vaccination before covid was for the swine flu where one of the vaccines showed a lot more adverse effects than the others (7x) https://www.contagionlive.com/view/high-rates-of-adverse-eve... Also a lot of people became sceptical when they tried to get the children vaccinated for covid even though there were almost no adverse effects on children from the natural infection. It is possible to be sceptical of one vaccine and not all vaccines.