A few weeks ago our 9 y.o. (non vacc'd) went down with Covid.
A week later, GF. Even though triple vacc'd (2 x Sino, 1 x AZ),
I. (2 x AZ, 1 x Pf) Panicking as had just booked and paid for a trip home, nothing. Tested every day ATK and a couple of PCRs. All negative. Even though had been in close contact.
Don't know why I wasn't infected. Must have had the good stuff.