Lung infection: You did not specify how long you have been sick but you should have had a chest x-ray done to confirm what "lung" infection you have. It it's a viral infection, you do not need another round of antibiotics. If you 've had a persistent cough, testing you for pertussis or whooping cough should also be done. The treatment for that condition is azithromycin, Clarithromycin or erythromycin.
Answered 9/28/2016
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Certain?: Has an infecting organism been isolated - several failed antibiotic courses may mean your symptoms are due to another cause - this possibilty is worth discussing with your doctor and potentially seeing a pulmonologist who can review your case.
Answered 11/12/2012
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