What is the infectious agent of bronchitis?

Bronchitis is an inflammation of the bronchial tubes, which are the primary air passages to and from the lungs. It can be caused by a variety of infectious agents, including:

- Viruses: Viruses are the most common cause of bronchitis, and there are many different types of viruses that can cause the condition. Some of the most common viruses that cause bronchitis include the influenza virus, the parainfluenza virus, the respiratory syncytial virus (RSV), and the adenovirus.

- Bacteria: Bacteria can also cause bronchitis, but they are less common than viruses. Some of the bacteria that can cause bronchitis include Streptococcus pneumoniae, Haemophilus influenzae, and Mycoplasma pneumoniae.

- Other infectious agents: In rare cases, bronchitis can be caused by other infectious agents, such as fungi or parasites.

In most cases, bronchitis is a mild condition that resolves on its own within a few weeks. However, it can sometimes lead to more serious complications, such as pneumonia or hospitalization.