It's happening in California right now with whooping cough - http://www.newscientist.com/article/dn19363-whooping-cough-outbreak-could-be-worst-in-50-years.html

It's happening in California right now with whooping cough - http://www.newscientist.com/article/dn19363-whooping-cough-outbreak-could-be-worst-in-50-years.html http://www.newscientist.com/article/dn19363-whooping-cough-o...