Kaplan-Meier survival curves for patients who underwent bronchoscopy, stratified by microbiological results, and patients who did not undergo bronchoscopy (short dashed line). Patients who underwent bronchoscopy were further divided into BAL positive for RSV (solid black line), BAL positive for RSV and another respiratory pathogen (solid grey line), BAL positive for only a non-RSV respiratory pathogen (long dashed line) and a BAL without growth (alternate short and long dashed lines). A log-rank test showed significant differences in survival rates between groups (log-rank test, p=0.001).