Estimated antimicrobial susceptibility of oral beta-lactam antibiotics and their suitability for empirical treatment of uncomplicated urinary tract infections in Slovenia

  • Kristina Nadrah Department of Infectious Diseases and Febrile Illnesses, University Medical Centre Ljubljana, Ljubljana, Slovenia
  • Iztok Štrumbelj Oddelek za medicinsko mikrobiologijo Murska Sobota, Nacionalni laboratorij za zdravje, okolje in hrano
  • Bojana Beović Klinika za infekcijske bolezni in vročinska stanja, Univerzitetni klinični center Ljubljana, SlovenijaMedicinska Fakulteta, Univerza v Ljubljani


Background: Uncomplicated urinary tract infections are among the most common infections in young healthy women. When treating such infections we use narrow-spectrum antibiotics with activity against the most common pathogens. The treatment of such infections is usually empirical, therefore in our study we estimated the susceptibility of the most common isolates to oral betalactam antibiotics to determine whether they are an acceptable alternative in case of contraindications to first-line agents.
Methods: We used a theoretical distribution of the frequency of urinary tract pathogens and antimicrobial susceptibilities from clinical urinary cultures in women to calculate an estimate of overall susceptibility of the pathogens using a mathematical model.
Results: The estimated susceptibility to ampicillin was low (50 %), but much higher for cephalosporins of 1st to 3rd generation (88 % – 90 %).
Conclusion: The mathematical model for susceptibility estimation represents an interesting tool for predicting clinical efficacy of antibiotics, based on local antibiotic susceptibility and frequency of pathogens. Our results show that among betalactam antibiotics, 1st generation cephalosporins are suitable for the treatment of uncomplicated cystitis.


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How to Cite
Nadrah K, Štrumbelj I, Beović B. Estimated antimicrobial susceptibility of oral beta-lactam antibiotics and their suitability for empirical treatment of uncomplicated urinary tract infections in Slovenia. TEST ZdravVestn [Internet]. 28Oct.2019 [cited 9Apr.2020];88(9-10):458-3. Available from:
Case report, short scientific article