Acute bronchitis

 Acute bronchitis is an infection in the passages that carry air from the throat to the lungs. In such cases, these tubes become inflamed and collect mucus, making it difficult to breathe and causing a caught that produces phlegm. In 95 % of cases, acute bronchitis is caused by a virus and is spread from person to person through coughing. In some cases, other tiny microbes called mycoplasma or chlamydia may be responsible. The cough usually lasts for about a week to ten days but in about half of patients coughing can last for up to three weeks and 25% of patients continue to cough for over month.