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How a bacteria acquires resistance to antibiotics

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I need this to be put to me in layman's terms: how does bacteria acquire MRSA resistance?

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This is a non-technical description of how bacteria become resistant to antibiotics.

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Bacteria acquire antibiotic resistance, through the process of natural selection.

In any given population of bacteria there is genetic variation - not as much as in a species which reproduces sexually, but some genetic variation. Some bacterium have genes that make them more resistant to antibiotics than others. When an antibiotic is introduced into the population, those bacteria that have the gene making them ...

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