Since most kids (with responsible parents) are vaccinated against measles, if there is an outbreak the child is sent home and separated from the other kids, but the entire house isn't usually put into isolation. However, since many stupid assholes who think they know better than the doctors, have decided not to vaccinate because they don't really believe what a horror show measles, mumps and chicken pox can be, they aren't worried about blindness, loss of hearing or death....especially if it only happens to others...you know, the unlucky ones.
When you and I were children, it was a much bigger deal.
I agree that it is still not to be trifled with, but if you've had measles or were vaccinated it shouldn't be a problem. I wouldn't share spoons or combs, but other than that.......