I would say especially COVID, but do your own research on all the other vaccines. I recommend starting with the book, Turtles all the Way Down. In the best case, they reduce morbility, in the worst case, it's likely poison going into your body. The book takes you nicely by the hand and only cites work and studies published by the centralized authorities (funny how they contradict themselves), so no fringe random studies done by supposed wakos.