SUMMARY: A strain of Salmonella typhimurium, in which the H antigens had been altered by transduction with a bacteriophage lysate of S. abony to the form b ⟷ enx has been found to revert in the first or second phases giving rise to organisms with the structure i ⟷ enx and 6 ⟷ 1.2. No reversions in both phases have so far been detected. This phenomenon has been observed only in non-lysogenic strains; lysogenic varieties have remained stable.
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Spicer et al. (1959) studied this question.
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