Bacteria experience random DNA mutations, which can change the way they behave. Strains that are resistant to antibiotics are developing as a result of the gene.
In the billions, bacteria reproduce. A copy of a gene's DNA that makes a bacterium resistant to drugs may be passed on from one bacterium to another. The newly added DNA makes previously non-drug-resistant bacteria drug-resistant. Only drug-resistant bacteria can survive when there are drugs present.
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