Pertussis is mainly transmitted through airborne droplets and is a commonly seen respiratory infectious disease in clinical settings. If a child is at school and classmates have pertussis without antibodies in their body, it is quite possible for the infection to occur, commonly seen in babies under five years old. If there are episodes of spasmodic, convulsive coughing accompanied by a barking sound or a crowing sound during inhalation, this disease should be highly suspected, and prompt culturing of the pathogen is needed for confirmation.