Etiologia e sensibilidade bacteriana em infec？？es do tracto urinário

introduction: urinary tract infections (uti) are very prevalent in humans immediately following respiratory infections. the main microorganisms involved have remained relatively constant over time, and their treatment, in many cases, has been done empirically, making use of antibiotics that, in principle, are supposed to have an extended-spectrum and are able to eradicate the infection. objective: the main objective of this work was to understand the behaviour of the most prevalent strains that cause urinary tract infections and assess if we can discern some trends in their resistance to antibiotics during two different time periods. material and methods: the retrospective study was carried out at local health unit (guarda), involving the use of 200 cultures with a positive result, for half of the year 2002 and for the rest of the year 2007. all urine samples were plated on agar cled. the identification and their respective antibiotic were performed at vitek 2 system (biomérieux). results: the main results suggested that the most prevalent strain in 2002 was e. coli constituting 64% of the strains identified, followed by s. marcescens with 16% and k. pneumoniae with 14%. for the year 2007, e. coli prevailed again with 66% of urinary infections, followed by p. aeruginosa with 14%. as far as the behavior of more prevalent strains towards antibiotics is concerned we found that there was an increased sensitivity of escherichia coli compared to amoxicillin (68.8% in 2002 to 93.9% in 2007), compared to ampicillin (56.3% in 2002 to 75.8% in 2007) and to cephalothin (84.4% in 2002 to 93.9% in 2007). it only increased its resistance to trimethoprim, in 2002 it had a resistance of 18.8% and this number rose to 24.2% in 2007. klebsiella pneumoniae has increased its capacity of resistance to amoxicillin (0% in 2002 to 75% in 2007), became completely resistant to ampicillin and reduced its sensitivity to cephalothin (85.7% in 2002 and only 25% in 2007). they also increased their