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Appl Environ Microbiol. 1968 February; 16(2): 301-307
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Antibiotic Susceptibility of Anaerobic Ruminal Bacteria¹

Department of Bacteriology, North Dakota State University, Fargo, North Dakota
Metabolism and Radiation Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Fargo, North Dakota 58102

ABSTRACT

This study demonstrated that 15 species of ruminal bacteria with no previous history of contact with antibiotics are susceptible to bacitracin, chloramphenicol, chlortetracycline, erythromycin, novobiocin, oleandomycin, oxytetracycline, penicillin, tetracycline, tylosin, and vancomycin. A number of the species were not inhibited by kanamycin, neomycin, polymyxin, and streptomycin. The data suggest that antibiotic-resistant cells occur within susceptible cultures of these species. Streptococcus bovis FD-10 and a nonruminal anaerobe, Bacteroides melaninogenicus BE-1, showed similar antibiotic susceptibilities.

¹ Published with the approval of the Director of the North Dakota Agricultural Experiment Station as Journal Article No. 123.