What is "pertussis"?

Pertussis, also known as whooping cough, is a highly contagious bacterial infection that affects the respiratory system. It is caused by a bacterium called Bordetella pertussis. The disease is characterized by severe coughing fits that can last for weeks. Pertussis is particularly dangerous for infants and young children, but it can affect people of all ages. Vaccination is the most effective way to prevent pertussis.