Samples analyzed from isolated environments have demonstrated that antibiotic resistance is a natural and ancient phenomenon that predates clinical antibiotic use (Miteva, Sheridan and Brenchley 2004; D’Costa et al. 2011; Bhullar et al. 2012). Antibiotic resistance genes occur in native soils without anthropogenic selection pressure (Allen et al. 2009), but evidence suggests that their abundance in agricultural soils has been increasing since the 1940s (Knapp et al. 2010). Although the environmental or anthropogenic causes have not been determined, the gene level increases occurred during the same period when the industrial production of antibiotics was growing rapidly. Furthermore, agricultural intensification increased at the same time and antibiotics were used for growth promotion purposes, which ultimately made their way to agricultural fields via manure application (Davies & Davies 2010). Manure application can transfer ARB and ARGs to soils, as well as antibiotic residues and other xenobiotic compounds, resulting in the expansion of antibiotic resistance reservoirs when compared to that of nativesoils (Heuer & Smalla 2007; Cytryn 2013; Amarakoon et al. 2016; McKinney et al. 2018).
Samples analyzed from isolated environments have demonstrated that antibiotic resistance is a natural and ancient phenomenon that predates clinical antibiotic use (Miteva, Sheridan and Brenchley 2004; D’Costa et al. 2011; Bhullar et al. 2012). Antibiotic resistance genes occur in native soils without anthropogenic selection pressure (Allen et al. 2009), but evidence suggests that their abundance in agricultural soils has been increasing since the 1940s (Knapp et al. 2010). Although the environmental or anthropogenic causes have not been determined, the gene level increases occurred during the same period when the industrial production of antibiotics was growing rapidly. Furthermore, agricultural intensification increased at the same time and antibiotics were used for growth promotion purposes, which ultimately made their way to agricultural fields via manure application (Davies & Davies 2010). Manure application can transfer ARB and ARGs to soils, as well as antibiotic residues and other xenobiotic compounds, resulting in the expansion of antibiotic resistance reservoirs when compared to that of native<br>土壤(雅&2007 Smalla; Cytryn 2013; Amarakoon等人2016; Mckinney等人2018)。
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