A 3 year old female child developed fever, cough and respiratory distress. On the chest, X-ray consolidation is seen in right lower lobe. She improved with antibiotics but on follow up at 8 weeks was again found to have increasing consolidation in right lower lobe. Your next investigation would be –
"Plain chest radiography is the mainstay in diagnosis and monitoring progress of pneumonia. CT is used when complications are suspected".
Bronchoscopy
Bacterial culture of the nasopharynx
CT scan of the chest
Allergen sensitivity test