Coquohvan I think that’s looking to be really rare. However it is worrying me. I’ve had chicken pox twice, whooping cough twice despite being vaccinated, and when I was pregnant with DS1 I showed up non-immune to rubella, despite having had all my vaccinations and boosters as a child, a further booster during a mumps epidemic at university, and yet another booster when I worked in a healthcare setting. Literally 2 years later I had no immunity again.
But it’s worrying me because I’ve got form for not gaining immunity. Hopefully most people will be fine.