Source of antibiotic resistance genes for human pathogens? 1.Antibiotic-producing bacteria 2.Other human/animal pathogens that are already antibiotic resistance 3. Other human-associated bacteria (non-pathogens) that are already antibiotic resistance 4. Free-living bacteria (e.g., soil, air) that are already antibiotic resistance Aminov RI, Mackie RI. 2007. Evolution and ecology of antibiotic resistance genes. FEMS Microbiology Letters 271: 147-161.
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