It's that time of year again (although not here in Auckland where we are baking in glorius heat). I'm one of those who have never had flu in my 50 years.

Why some people don't get the flu - TODAY Health -

To answer that question, University of Michigan researchers did the first study of its kind: They infected 17 healthy people with the flu virus and discovered that everyone who is exposed to the flu actually is affected by it, but their bodies just have a different way of reacting to it. Half of the study participants got sick; the other half didn’t notice a thing.

“There is a behind the scene active immune response even when you don’t get sick,” Hero says. “What we found were differences in their biological metabolism and gene expression. These differences had to do with antioxidants.”
So maybe I have had flu after all. I'd be interested to hear other opinions on symptom-free flu. Have you had it?