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From a discussion of the literature the author concluded that the genus Brucella had developed from an ancestor species comprising Brucella, Pasteurella and Francisella. The final differentiation was probably completed some 20-25 million years ago, i.e., long before the domestication of the...

Aslanyan, R. G.
Zhurnal Mikrobiologii, Epidemiologii i Immunobiologii, 1967, 44, 1, pp 16-22 pp.