I don’t remember my kids ever having influenza, and two of them are now adults. I don’t remember having it…

I don’t remember my kids ever having influenza, and two of them are now adults. I don’t remember having it myself more than once in my decades of life. Is there asymptomatic influenza, or mild influenza? Or is this just more perversion of the hygiene hypothesis? https://t.co/D3Ue5yVude