[Romantic Old Bird]

This phenomenom has been reported elsewhere before - Africa I think.

We also don't know why some people seem almost immune and others don't.

As with any pandemic, there will be a few who are immune, and a few whose immune system manages to suss it out.

I think if I were this bloke I would be delighted to be alive and only too glad to be a guinea pig. Imagine if you held the key to ending such misery?

However, if he really has somehow managed to fight this off, it will still be a massive job to work out what genetic markers he has, what his precise medical history is etc.