Have I dodged Covid? And skin colour and health

I think I might’ve dodged Covid. Like many others, I’m fully vaccinated but have never tested positive despite having had plenty of opportunities to catch it. I used public transport to get to work during the lockdowns and was exposed to the virus when my son came down with it. So what’s going on? Armed with my covid antibody test results, I ask immunologist Prof Mala Maini to clear up the confusion. And a new scale to determine skin colour which could improve how certain health problems are diagnosed and treated.PRESENTER: James Gallagher PRODUCER: Beth Eastwood