This.
I got very upset last spring, when my neuropsych professor, a woman a little younger than me, went on a rampage about vaccines, how she didn't let her kids get vaccinated (they are now 16, 18) and the "crap" she had to go through because of this. There were younger, impressionable grad students in the class, who were just eating up her words.
My oldest son had pertussis when he was turning 14. He came home from overnight camp with what we thought was allergies, or bronchitis, until finally, around Oct. 1st, we determined it was pertussis. This was because when he was an infant, he actually did have one of the "unusual" reactions to his first DPT shot (high pitched screaming), so he only got the DT part of the shot for the rest. My other son didn't get the pertussis vaccine, either. I would have rather had him get a shot, than seeing him as sick as he was. I thought he was going to die when he was coughing so badly and couldn't catch his breath.