Farming Practice Influences Antimicrobial Resistance Burden of Non-Aureus Staphylococci in Pig Husbandries.

Statistically highly significant differences between conventional and organic farm isolates were detected for resistance to erythromycin (56/145 vs. 4/41; p = 0.000961) and clindamycin (81/145 vs. 6/41; p = 6.985 × 10 −6 ), as well as for tetracycline resistance in the alternative farm isolates ( p = 0.0001873) ( Figure 2 B and Table S3 ).

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With respect to beta-lactams , the methicillin-resistance mediating mecA gene was absent in the 41 organic farm isolates and was rare in isolates from alternative farms (1/54; 1.8%), while mecA was present in 10/145 (6.9%) of the conventional farm isolates, although differences did not reach statistical significance ( Table S3 ).

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