Richard Quest: After recovering from Covid-19, I thought I was safe. Now my antibodies are waning

I recovered from Covid-19 back in April. I was fortunate: My symptoms, while nasty, were minor compared to others. I had the hacking dry cough and I was fatigued to the point where I would spend many hours on the sofa. But I never had breathing difficulties, nor required hospital treatment. Whenever the question of catching it again has come up since, I airily and hubristically said, 'Oh, I've had it, and have antibodies to prove it.' At least I did until Friday, when my third antibody test came back negative. I was in shock. Even though it's not clear antibodies do actually offer immunity, I had treated my previous AB positive tests as a shield I could wave, crying, 'Been there. Done that. I'm OK.' Rightly or wrongly. Now my precious protection had vanished.