Acute Pulmonary Exacerbation Phenotypes in Patients with Cystic Fibrosis.

The etiology of cystic fibrosis (CF) pulmonary exacerbations (PEx) is likely multifactorial with viral, bacterial, and non-infectious pathways contributing. To determine whether viral infection status and CRP (C-reactive protein) can classify subphenotypes of PEx that differ in outcomes and biomarker profiles. Patients were recruited at time of admission for a PEx.