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The Brucella abortus B19 vaccine strain differs from other Brucella strains in its sensitivity to erythritol. However, erythritol tolerant (Eri t ) mutants arise from sensitive cultures of B19 at high rate, and may cause persistence and/or abortion when the vaccine is inoculated on adult cattle. Twelve different batches of B19 have been examined for the presence of Eri t mutants....
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