Biology / Bio 1967 · Atom · ~20 seconds
Antibiotic Resistance Mechanism
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Antibiotic resistance spreads when a resistance allele, already present at low frequency or transferred in, is selected for as susceptible bacteria die off.
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A resistance gene can move between bacteria by conjugation, spreading resistance faster than mutation alone would.
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Antibiotic use does not create resistance genes — it selects among variants that already exist or arrive by transfer.