Pertussis is highly contagious respiratory tract disease, which is caused by gram-negative bacteria Bordetella pertussis. It can be difficult to diagnose in adult patients, because of the fact, that whooping cough which is the most characteristic symptom of pertussis, is uncommon. Each adult patient with prolonged and nonspecific cough should be considered in a case of pertussis. Erythromycin is an antibiotic of choice in pertussis treatment.