The contagious period for whooping cough typically requires about 20-40 days and should be determined based on the amount of Bordetella pertussis bacteria in the body and the patient's constitution. Being a respiratory infectious disease, it spreads through the patient's coughs, sneezes, and discharge of secretions. If a person with a weak constitution and no antibodies comes into contact with the pathogen, healthy individuals might become infected and develop the disease, which is most commonly seen in infants under five years old. Thus, prevention is crucial for this disease. Vaccination should be administered at three months of age, and after antibodies are produced, reinfection generally does not occur.