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MEDICINSKI GLASNIK

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178<br />

Medicinski Glasnik, Volumen 6, Number 2, August 2009<br />

rather than the overuse of these drugs in humans<br />

as proposed previously (12). Antibiotic-sensitive<br />

bacteria that are gradually exposed to increasing<br />

concentrations of a given antibiotic develop increasing<br />

resistance to that antibiotic and that induces<br />

the resistance increase to other unrelated<br />

antibiotics. The development of a MDR phenotype<br />

suggests that the development of multidrug<br />

resistance in Gram-negative bacteria in patients<br />

treated with subinhibitory doses of the antibiotic<br />

occurs via the same mechanism (30).<br />

The prevalence of erythromycin-resistance for<br />

human isolates (32.1%) reported in this study has<br />

surpassed the usually reported rates (

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