http://www.fridayschildmontessori.com/blog/727/ Whooping cough or pertussis is a very infectious disease that is characterised by prolonged coughing fits, often with a “whoop” sound during attempts to inhale, and frequently followed by vomiting. It can develop into complications such as pneumonia and even brain damage, and it is particularly serious in babies. Vaccination is a key part of prevention, which includes ensuring that four-year-olds have had booster shots. See your doctor if you or your child has a cough that doesn’t go away, and stay away from infants and women in late pregnancy.