Exacerbation, mostly of an infectious etiology, are frequent cause of morbidity and mortality in COPD patient. The rle o bacterial patern in sputum of patients wirh acute bacterial exacerbations of COPD, the possible relation between functional respiratory impairment (measured by FEV1) and isolation of diverse pahogens in the sputum and to determine the role of Echinacea purpurea in bacterilogi…