[Etiological factors in secondary bacterial infections from the authors' own clinical material].

: An analysis of etiological factors of secondary bacterial infections was carried out in 64 patients with pneumonias. In most of the patients gram negative rods were cultured. Most often the pneumonias were caused by Klebsiella pneumoniae and Escherichia coli. A single causative agent was found in the majority of the patients (60.7%), less frequently two, least three.