Table 2.

Risks factors for bronchiolitis obliterans syndrome after lung transplantation.

Probable	Potential
Acute rejection	Aspergillus colonization of the lower airways
CMV pneumonitis	Aspiration
HLA-mismatching	CMV infection (without pneumonitis)
Lymphocytic bronchitis/bronchiolitis	Donor antigen-specific activity
Noncompliance with medications	Epstein-Barr virus reactivation
Primary graft dysfunction	Etiology of native lung disease
	Gastroesophageal reflux
	Older donor age
	Pneumonia (gram negatives, gram positives, fungi)
	Prolonged allograft ischemia
	Recurrent infection other than CMV