Is acute bronchitis contagious? First, we need to understand what is acute bronchitis. What factors can cause acute bronchitis? It is currently believed that many factors including biological, physical, chemical irritants, or allergies can lead to acute bronchitis.

Among these factors, biological factors are the most common, especially infections by microbes, which include viruses, bacteria, mycoplasma, and chlamydia. These can potentially be transmitted to other people through droplets or other methods. Common agents include influenza viruses and chlamydia.

Other factors can also cause bronchitis, such as cold air, irritant gases, or smoke irritation, as well as allergens like pollen and dust. These cases generally are not transmitted by infection, so they do not spread to other people.