Absolutely — and this is one of the most important points I make at Pulmovista Clinics. Lung infections in Delhi can be caused by bacteria, viruses, fungi (particularly Aspergillus), and — in some patients — mycobacteria (including tuberculosis and non-tuberculous mycobacteria). The distinction matters enormously because antibiotics are completely ineffective against fungal and viral infections, and mycobacterial infections require entirely different treatment regimens. A Pulmovista investigation — including sputum fungal culture, Aspergillus serology, and mycobacterial culture — determines the causative organism precisely, rather than assuming it is bacterial.