Nontoxic strains of Vibrio cholerae can become toxic when they are in the human intestine with toxic strains of bacteria. This suggests that the toxin genes are acquired by

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The process described is transduction, where genes, including those for toxin production, can be transferred from one bacterium to another by viruses (bacteriophages). This can result in nontoxic strains of bacteria acquiring toxin genes from toxic strains.

Nontoxic Strains of Vibrio Cholerae Can Become Toxic When They