Pertussis treatment with erythromycin takes 14 days. Pertussis is an acute respiratory infection caused by Bordetella pertussis. The main paroxysmal spasmodic cough accompanied by a deep and long “chicken” kind of inspiratory roar, if you do not get timely and effective treatment, the course of the disease can be delayed for a few months or so, so it is called “whooping cough”. Pertussis once diagnosed, should be as early as possible (1 ~ 2 weeks after the onset of disease) with erythromycin drugs can reduce or even do not spasm cough, usually 14 days for a course of treatment, more than 14 days of general whooping cough into the non-cartesian period (migrating postponed), for the non-cartesian period (migrating postponed) patients with whooping cough, do not recommend the use of erythromycin treatment. Patients with pertussis should go to the hospital in a timely manner, by the doctor according to the symptoms, signs and auxiliary examination to give the appropriate drug treatment.