1. Infective Exacerbations of COPD
Sayiner Abdullah , MD, Okyay Nurtac , MD, Unsal Ipek , MD, Colpan Nesrin , MD 
CHEST 
Volume 115, Issue 5, (May 1999)
DOI: /chest
Copyright © 1999 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Prevalences of group A and group B bacteria according to patients’ FEV1 levels. The numbers express the percentage of patients infected with bacteria in subpopulations with FEV1 levels below the indicated values.
CHEST  , DOI: ( /chest )
Copyright © 1999 The American College of Chest Physicians Terms and Conditions