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WE would like to report a neonatal lamb scour investigation in which multi-antibiotic resistant enterotoxigenic Escherichia coli with K99 antigen (ETEC K99) isolates were detected in a commercial sheep flock, to illustrate to practitioners that it cannot be assumed that commonly used antibiotic preparations will be effective. The Veterinary Medicines Directorate (VMD) collates laboratory submissions (culture and sensitivity) from the APHA and has previously found that multiresistant E coli isolates were increasing, and accounted for up to 54 per cent of isolates made over the period 2011 to 2013; spectinomycin resistance was observed in 39 to 59 per cent of isolates (VMD 2013).
There are other reports of high prevalences of resistance in neonatal lambs; for example, up to 76 per cent of E coli isolates from lambs in Spain showed resistance to tetracyclines, 50 …
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