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Effects of enterocoated β-lactamase pellets on the proportion of strains of coliform isolates from different treatment groups resistant to ampicillin (10 μg) during the experimental period. The duration of the treatment period was 14 days. Light gray bars, ampicillin plus TRBL; dark gray bars, ampicillin plus placebo; open bars, placebo i.v. and placebo p.o.
