Thanks for your question on Healthcare Magic. I can understand your concern. Diabetic patients are at increased risk of bacterial, fungal and parasitic infection due to poor immunity. Lung infection is especially more common because lungs are exposed to environmental air directly. Broadbectum injection is for bacterial infection. Best treatment for lung infection should be guided according to culture and sensitivity report. Culture report will isolate the causative organism and sensitivity report will guide about effective antibiotic treatment. So get done repeat bronchoscopy and BAL (bronchoalveolar lavage) analysis, bronchoscopic Biopsy for further evaluation. Also get done BAL for fungal culture and anaerobic culture to diagnose fungal and uncommon bacterial infection. On the basis of these reports, she might need antifungal or other higher antibiotic with anaerobic coverage. In Kolkata, visit wokhardt hospital. Hope I have solved your query. I will be happy to help you further. Wishing good health to your mother. Thanks.