This is interesting and worrying at the same time, we seem to be having a hard time as it is with convincing people when they should and should not be using anti biotics.
It shows how nature can adapt and quickly to a given situation, I wonder how much of this, is down to more than taing anti biotics, there was a time when kids would get dirty,usually through play and could build up natural immunity, now we are obsessed with killing every known bug out there so we are never exposed to much in the way of bacteria.