Chronic bronchitis refers to some chronic non-specific inflammation of the bronchial mucosa and surrounding tissues. Its main symptoms are coughing and expectoration, so many people are concerned about the contagion from patients with chronic bronchitis. However, chronic bronchitis itself is not a contagious disease and is not considered for acute infectious disease management. This means that most of the time, it is relatively safe to be in contact with patients suffering from chronic bronchitis. Nonetheless, there are some exceptions, such as certain cases where a chronic bronchitis patient might also be afflicted with mycoplasma infections or certain viral infections, such as H1N1 influenza, H3N2 influenza, or other infections like tuberculosis. In such cases, the chronic bronchitis patient may potentially be infectious.