There hasn't been a proper outbreak where I live for years. A couple of kids get it, but then it just fizzles out.
There has been a huge outbreak recently in a nearby village where my son's best friend sometimes attends creche.
Son's friend caught it, but ds didn't - despite rolling around with him the day before he got spots. Son's friend was at toddler group the same day, and not a single child from toddlers caught it. Neither did another friend who was with this boy all afternoon.
So no-one from our village caught it, apart from this boy and a girl who also attends the other creche sometimes. She didn't even pass it on to children who go to the same childminder.
Weird, don't you think?