Abstract
Summary
“Typical” Brucella abortus and B. suis strains were found to mutate spontaneously to dye-resistance (thionin and fuchsin, resp.) at an average rate of 6 × 10-10. Most of the resistant mutants, and also mutants displaying altered CO2-requirements, competed successfully with their typical parent type in vivo. The significance of naturally occurring aberrant Brucella strains and taxonomic problems have been discussed in the light of these findings.
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