Pertussis, a respiratory infectious disease, can also be transmitted to adults, although the chances are generally small. It mostly occurs in adults with low immunity and those who are frail and ill when they come into contact with the pathogen. The incubation period is about two to three weeks, during which paroxysmal cluster-like coughing occurs, causing facial redness and a runny nose. Some may also experience nausea and vomiting. It is necessary to check chest X-rays, routine blood tests, and sputum pathogen cultures for diagnosis. Early detection and treatment are crucial to prevent other complications.