Abstract
The clinical and bacteriological data concerning nine severe (and sometimes fatal) infections due to Aerobacter cloacae, and the results of a concomitant comparative study of the in vitro resistance of A. cloacae. Klebsiella pneumoniae, and Escherichia coli to the antibiotics in common use have been analyzed and presented in this report. Accordingly, significant findings include the observation of: (1) differences between the portal of entry and pathogenesis of A. cloacae infections, and K. pneumoniae and E. coli infections, (2) differences between these three species in regard to their colonial appearance on eosin-methylene-blue agar plates and their biochemical characteristics, and (3) differences between these three bacterial species in regard to their in vitro-drug resistance. In retrospect of these findings, the importance of identification (bacterial species) and nomenclature of these "opportunist" pathogens, in relation to human disease and antibiotic susceptibility, is discussed.

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