Reference | BQ2XV7A7 (24) (Excluded)

Our aim was to evaluate the effect of individual and groupwise oral administration of amoxicillin on the occurrence of resistance to ampicillin and other antibiotics in commensal E. coli from treated and untreated contact broilers during their life. A second aim was to study the effect of repeated treatment on antibiotic resistance.

We obtained 125 five-day-old clinically healthy chicks of Ross 308 from a single hatchery (Supplementary Data). Each of the 125 chicks was assigned to 1 of the 5 groups: I, individual treatment with amoxicillin (through drencher); G, groupwise treatment with amoxicillin (through drinker); KI, contact with I; KG, contact with G; or C, control that was treated late in the study (Fig. 1). The chicks were randomly allocated into these five groups of 23 animals per group, by picking one chick after the other out of the breeder’s transport box and placing every jth chick into groups I, KI, G, KG, and C.

AST Method: Selective Media

Reference explicitly reports AST breakpoints: None

Reference reports using a MIC table: None