FIG 4.

Immunoblot probed with peroxidase-conjugated anti-human IgA showing IgA protease activity of strains isolated from two patients with COPD (noted at the top) upon acquisition (the lower visit number noted at the bottom) and just before clearance from the host (the higher visit number noted at the bottom). Number of colonies, the number of individually collected colonies that were tested for IgA protease expression upon isolation; Cleavage, IgA protease activity. Molecular mass markers (in kilodaltons) are shown on the left. The lower portion demonstrates individual colonies at the time of collection that were assayed for IgA protease activity to show the population of expression.