Whooping cough wave now worst in almost a decade amid back-to-school surge CBS NewsWhooping cough cases on the rise throughout Nebraska KETV OmahaMayo Clinic Minute: What is whooping cough? Mayo ClinicWhooping cough cases in Wisconsin are 12 times higher than last year, DHS says Milwaukee Journal SentinelState reporting ‘significant increase’ in whooping cough cases WISN Milwaukee