Already told this story, but basically my mother overreacted to a vaccine in the 80s, became an early antivax, had me, only did the bare minimum, I got pertussis at 4-5yo (lucky it wasn't earlier), and since no doctor in the area ever saw pertussis (everyone being vaccinated at the time, and everybody thought I was too, through my mother antibodies), I spent 4 month coughing (I was told), until a retired doctor diagnosed me, and then a few months again, but it was manageable. I have three memories of that time, the first three memories of my life: once coughing so hard I cried on the playground, one lying on my grandmother couch, coughing while she helps me drink, and one after getting treatment (probably for the first time?).

My siblings all got vaccinated after that, and my mother stopped being antivax (still taking 'alternative' medecine, but also still taking conventional one). I guess seeing your child in so much pain and develop arythmia because of your 'beliefs' can make you change. Hopefully things like this will be less and less common.