Others may be able to catch bronchitis from someone with a cough, according to WebMD. If a person has acute bronchitis, which is caused by a cold or flu virus, the virus is contagious. As a result, acute bronchitis is usually contagious as well.
There are two types of bronchitis, states WebMD. Chronic bronchitis is caused by lung irritants such as dust, chemicals, or smoke. It typically lasts a few months or longer and often occurs year after year. Chronic bronchitis isn't contagious. Acute bronchitis can last for one to three weeks. It is typically caused by a virus, so it is often contagious. Depending on the type of virus causing the bronchitis, a person is usually contagious for as little as a few days or as long as a week.