Bronchitis cough can cause person-to-person transmission. Cough is a very common, complex, defensive reflex activity of the body and its helps the body to expel foreign bodies and mucus from the lungs. Bronchitis is an inflammation of the bronchial mucosa that has no epidemic tendency, but its can be transmitted. Because of the presence of pathogens in the airways of the patient, they are spread in the air by means of coughing as a carrier of droplets. When a normal person inhales droplets with pathogenic bacteria, the pathogenic bacteria are colonized in the respiratory tract of the infected person. If the infected person has a strong immune system, he or she usually does not develop the disease; when rain, cold, overwork, or sudden changes in climate can cause a decrease in respiratory defenses, the viruses and bacteria that normally exist in the airways can rapidly multiply and cause disease. Therefore, coughing can cause the spread of disease from person to person.