Antimicrobial use and residues in calves in northern New South Wales

Mass screening for antimicrobial resistant Escherichia coli in dairy cows in northern New South Wales

“…Most of this 'uncommon but widely dispersed' pattern of distribution is attributable to resistance to sulfamethoxazole alone (gatS) and presumably reflects previous widespread use of sulphonamide drugs in the population of herds surveyed. 13 Importantly, the sulphonamide family of antimicrobials has a low 'importance rating' in human medicine. 30 Multiple resistance phenotypes are likely to be of much greater interest in public health and, although some were present in the population studied, they were uncommon.…”

“…In 1993, cattle owners from this area who sent residue-affected calves (beef and dairy) to slaughter were surveyed to establish what antimicrobials were used to treat calves. 13 From this it was found that tetracyclines, penicillins, sulphonamides and aminoglycosides were commonly used.…”