trimethoprim resistance plasmids in escherichia coli isolated from cases of diarrhoea in cattle, pigs and sheep.a total of 1572 isolates of escherichia coli obtained from the faeces of young farm animals with diarrhoea over the period 1980-1983 were screened for resistance to trimethoprim (tp). resistance to tp was detected in 263/954 (28%) of bovine isolates, 59/441 (13%) of porcine isolates and 15/177 (9%) of ovine isolates. seventy-five resistant isolates from separate outbreaks of infection on farms within a 25 mile radius of nottingham were examined in detail. sixty-eight (91%) of the 75 isolates wer ...19853897163
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