I know I questioned the way it worked too as the only person that had had to isolate originally in our family throughout the pandemic was my youngest whose 13. He’s had to isolate 5 times since sept 2020 due to class bubbles then had to repeatedly isolate because of us. Thankfully we have all recovered and it’s madness how 4 of the kids 22 20 16 and 13 haven’t contracted it yet my 17 18 year old and me and hubby did. I will say it’s bloody awful if you get a bad dose.Wow that’s mind blowing, thankfully we have never had it so wasn’t 100% sure how it worked x