A non responder is some one who gets vaccinated but no antibodies show up in a blood test.Sorry for you’re losses and lot’s of strength MROO.
My son thought he was a non responder too, having close friends who all got Covid. He had contact with them around the time the were infected.
Last summer he had one Jansen vaccination, just to be sure. And because he wanted to travel.
Last month many of his close friends (students) got Omicron, even after vaccination, he didn’t. But now, after a stressful week, it finally hit him. Luckily not very sick, but feeling poorly and quarantined for a few more days.