In Denmark, whooping cough (pertussis) cases have increased significantly during the spring and summer, with the authorities now reporting a figure more than ten times higher than normal. In the 37th week alone (up to September 16), 200 cases of whooping cough were detected (normally an average of around 20 cases per week).

Whooping cough is a respiratory infection that is characterized by a course lasting up to three months with severe coughing fits, often accompanied by howling breathing and vomiting immediately after the attacks.