Figure 3From: Specific IgA and metalloproteinase activity in bronchial secretions from stable chronic obstructive pulmonary disease patients colonized by Haemophilus influenzaeLevel of specific IgA against H. influenzae in patients colonized by this bacteria (n=21) and non-colonized patients (n=33). Results expressed as optical density (OD) ratio between patients and healthy controls.Back to article page