a prospective double-blind study was performed in which 30 adult patients with recurrent urinary tract infections due to escherichia coli , and proteus mirabilis organisms were treated by twenty-eight-day courses of either ampicillin , 500 mg. four times a day , or trimethoprim-sulphamethoxazole , 2 tablets twice a day .
C0014836
infections due to escherichia coli
C0002680
ampicillin