I was Googling about this (mainly after watching Pandemic and seeing Gwyneth Paltrows husband was immune for an unknown reason). Apparently there’s a high immune level amongst people who had it in 2020 and then had mRNA vaccines. I didn’t - I think I had it Feb 2020 but then had AZ vaccines. However, I haven’t had it since (as far as I know via three PCR and regular lat flow testing) despite two of the kids, my husband and eh a king car journey with someone who tested positive that day. Weird? Or just one of those things?