Recurrent urinary infections in adult women. The role of introital enterobacteria.

to penicillin-G and sulfonamide in the presence of only oxytetracycline therapy, as well as the subsequent loss of resistance after stopping therapy, are characteristic of resistance transfer factors. The transient appearance of resistant Gram-negative enterobacteria on the introitus following therapy, as seen in the E. coli NT present at the end of penicillin-G therapy, was common in this group of patients, but never of clinical significance.

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