According to MedicineNet, bronchitis is usually transferable to other people only when it is caused by a bacterial or viral infection, and it remains contagious as long as the sufferer exhibits symptoms. Bronchitis occurs when the bronchi, the main passages that carry air to the lungs, become inflamed.
To keep from catching bronchitis, Mayo Clinic advises avoiding close contact with infected people; frequently washing or sanitizing your hands; and avoiding touching your eyes, nose and mouth. In addition, Mayo Clinic recommends getting an annual flu shot to reduce your risk. Bronchitis sufferers should cover their noses and mouths when sneezing or coughing, notes MedicineNet.