Antibiotic Susceptibility of Klebsiella pneumonia Isolates from Hospitalized Patients in Three Referral Medical Centers in Isfahan, Iran

: Background: Klebsiella pneumoniae (K. pneumoniae) is a major cause of nosocomial and community-acquired infections (CAIs). Understanding the antibiotic susceptibility of this bacterium is essential for selecting the most effective antibiotic for associated infections. Objectives: We investigated the sensitivity of K. pneumonia (KP) isolates obtained from inpatients in Isfahan, Iran. Methods: Organism identification and antibiotic susceptibility testing were conducted using standard tests. Stratification was performed based on extended spectrum beta-lactamase (ESBL) production and the source of infection acquisition (community versus hospital). Results: A total of 437 KP isolates were investigated, of which 5.5% were pan drug resistant (PDR), 56.8% were extensively drug resistant (XDR), and 18% were ESBL producers. The isolates were most susceptible to colistin (100%), aminoglycosides (62.8%), and carbapenems (55%). Nosocomial isolates showed lower sensitivity to most of the examined antibiotics. Conclusions: The high prevalence of PDR and XDR KP strains in hospitalized patients is a major problem in the studied area.