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What causes the mutant form of disease-causing bacteria to become predominant?

April 26, 2017bacteria causes disease-causing form mutant predominant

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What causes the mutant form of disease-causing bacteria to become predominant?

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When an antibiotic drug is given to a patient, selection is being done in the evolutionary aspect of the bacteria. Only the drug-resistant mutants survive, since the selection does not affect them. All the non-mutant bacteria die; the mutants have no competition, and can flourish undisturbed.