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Percentage of positive findings for methicillin-resistant Staphylococcus aureus (MRSA) and extended-spectrum β-lactamase-producing bacteria (ESBL) after the first and the second sampling in relation to the pig fattening farms (time 1, open squares; time 2, filled squares). In the first sampling, samples for ESBL and MRSA from farm 6 were not analyzable.
