Who and what should we rely on in early diagnosis of idiopathic pulmonary fibrosis?

irreplaceable in the diagnostic approach to lower respiratory tract infections.By contrast, in our study, no information was collected about viral or mixed infection.Viruses may be isolated in up to 45% of severe COPD exacerbations, either alone or together with bacteria, and are likely to be present with fever, but their role in sputum purulence is unclear.