Shortsally
If you couldn't develop antibodies, no-one could recover at all. That is how the immune system works against viruses. The only question is how long the antibodies last. At the moment, the pessimistic guess is that it might only last six months. It's been less than six months since he had it, and he was clinically tested for coronavirus at the time. We know it wasn't flu.
Nobody has been deliberately reinfected with the virus to test immunity, but a pair of rhesus macaque monkeys have.
They were infected twice, once to build up an immune response and then a second time three weeks later. Those very limited experiments showed theydid not develop symptoms againafter such a quick reinfection.
www.bbc.co.uk/news/health-52446965?utm_source=dlvr.it&