Although the nonfermentative, asaccharolytic, putative anaerobes , and are phylogenetically related to the true campylobacters, the type strains of these species exhibited O-dependent microaerophilic growth in brucella broth and on brucella agar. The optimum O levels for growth of these strains ranged from 4 to 14% in brucella broth and from 2 to 8% on brucella agar, when H was provided as the electron donor. No growth occurred under 21% O, and scant or no growth occurred under anaerobic conditions unless fumarate or nitrate was provided as a terminal electron acceptor. Aspartate, asparagine, and malate also served as apparent electron acceptors. The organisms were catalase negative and, except for , oxidase positive. Catalase added to brucella broth enhanced growth. O uptake by all species was inhibited by cyanide and 2-heptyl-4-hydroxyquinoline -oxide. We concluded that these organisms are not anaerobes but instead are microaerophiles, like their campylobacter relatives.


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