There are some people with natural immunity to this virus.
My son has been around multiple people who have tested positive shortly after, even one day after being around him.
He and his wife were in the car with her parents for hours and then at dinner with them the day before they tested positive.
Believe me, he’s bummed that he hasn’t had it, lol.
Jvette,
What blood type is your son?
Kind of like when my three siblings at the time all got the mumps when we were kids but I didn’t?