For the second year in a row, the US has surpassed 25,000 whooping cough cases — another sign of the risks of falling vaccination levels. Often called the “100-day cough,” whooping cough or pertussis ...

Whooping cough is a highly contagious respiratory infection that can cause severe and prolonged coughing fits and can affect people of all ages, not just children. Medically known as Pertussis, it is ...