Indeed we don't - and we should! Our hospitals are overrun with it, staff members are off, patients go in for other stuff and contract it whilst in there. It's a nightmare and the disinformation and omission of truth is off the scale.
I know a couple of people who swear they've never had it but I also know people who have definitely had it - and we both know they've had it - and yet they also swear they've never had it. It's as if it's embarrassing or something now ...