I remember reading about asymptomatic carriers. It's a very real problem - and I've no idea (and don't know if anyone else has) whether children fall into this category.

I don't see how we can test everyone. That would require tests in the millions, and we'd have to keep retesting all the negatives. I think we're past the stage of clusters - it's too widespread in most countries now (though I think there are some places where it would still work)

It's easy to think that if we catch it and recover, we'll be fine, but I note what you've said about the long term effects from the '57 flu.