I agree that it hasn't reached pandemic proportions yet, but some of the diseases involved, such as whooping cough, are highly contagious and so when you're talking about several hundred additional cases over the norm, this is still worth taking note of because each one of those patients has the potential of quickly infecting many more.
I agree it’s a concern, just as similar resurgence of some contagious diseases is in the U.S. Unfortunately, many people haven’t been vaccinated for what were (until recently) the standard contagious illnesses, because they believed there was no risk of exposure to the disease. Oops.