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By evolving!

This methicillian resistant bacteria was not always that way, but as you may know every time an antibiotic is used there are always some variations of the bacteria that are resistant. They survive, reproduce and pass this resistance on to their progeny. And the process repeats so that soon, as bacterial generations are quick, you have super resistant bacteria. This is evolution by natural selection. Change in a population of organisms over time.

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Q: How does MRSA relate to evolution?
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