Whooping cough belongs to the notifiable infectious diseases in Brussels (link is external), Flanders (link is external) and Wallonia.
You can find more information about case definition, treatment and prevention in the Agentschap Zorg & Gezondheid (Care & Health Agency (link is external)) (link is external) or AViQ — Agence pour une Vie de Qualité (Agency for Quality of Life) guidelines.