Most cases of bronchitis are caused by a viral infection. Since antibiotics, such as amoxil, do not affect viral infections, they do not help treat them. Risk factors for bacterial bronchitis include a history of emphysema or chronic bronchitis, an immunocompromised condition (AIDS, on chronic steroids or chemotherapy), or a prior viral illness (such as bronchitis) that gets better and then gets worse acutely.
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