Isolation of bacteria causing urinary tract infection and their antibiotic resistance profile

Abstract

Urinary tract infection (UTI) is among the most frequent causes bringing male and female patients to the municipal health units in search of treatment. This paper aims at identifying the microorganisms responsible for this infection and at establishing their resistance profile against the antibiotics most commonly used in the municipal network. One hundred and twenty samples from patients clinically suspect to have UTI were collected and differentiated in CLED, MacConkey e chromogenic EC culture media in the Microbiology Laboratory I of the “Centro Universitário Positivo-UNICEP”. Positive samples were identified and characterized by antibiogram. 63,64% of the infections were caused by Escherichia coli and 18,18% by Staphylococcus aureus. More than 60% of the infections occurred in the age range from 12 to 33 years. The high number of samples found contaminated is an indicator for a certain difficulty in following the instructions for sample collection. Another relevant data is that 35,8% of the analyzed samples came from pregnant women. The antibiotics to which the bacteria responsible for UTI are sensitive are in great part not available at the Unified Health System but most of the isolated E.coli bacteria and 100% of Saureus showed sensitivity to the drugs Nitrofurantoin and Sulfametoxazole-trimetropim, which are available in the health units. With a compatible clinical picture, an empirical treatment with the referred drugs can be considered adequate, however post-therapy control examinations would be ideal for avoiding the appearance of resistant strains in the community.