Pertussis, also known as whooping cough, is an acute respiratory infectious disease caused by the infection of Bordetella pertussis. It is categorized as a Class B infectious disease according to national regulations. Bordetella pertussis has weak resistance to external environments and is generally not considered to spread through indirect contact. The primary mode of transmission is through respiratory droplets. Asymptomatic infected children are the main transmitters of the disease. Children under the age of five are the most susceptible. Babies typically receive their primary immunization at the ages of 3, 4, and 5 months, a booster immunization at 18-24 months, and another booster at the age of 6.