Aim: Serratia marcescens is a bacterial species associated with different types of infections including hospital acquired. The aim of this study was to examine the resistance rates to 3rd generation cephalosporins and carbapenems in S. marcescens isolates obtained from various clinical samples of patients hospitalized in two Bulgarian University hospitals. Materials and methods: A total of 180 non-duplicate clinically significant isolates of S. marcescens, collected during the period 2017-2021 were examined: blood, n=19; urine, n=64; respiratory tract secretions, n=36; wounds, n=44; others, n=17. Species identification and antimicrobial susceptibility testing were done by Phoenix (BD) and Vitek 2 (bioMerieux) automated systems. Double Disc Synergy Test (DDST) was used as screening test for detection of ESBL (Extended Spectrum Beta-Lactamase) production. Results: A total of 89 isolates (49.4%) were resistant to 3rd generation cephalosporins. Among these isolates, the DDST was positive in 32.2% (n=58). Isolates, resistant to 3rd generation cephalosporins were most commonly obtained from patients in Nephrology (n=31), Urology (n=12) аnd ICU (n=12). The highest rate of 3rd generation cephalosporin resistance was found among the urine isolates (25.6%, n=46), followed by blood (7.2%, n=13) and wound isolates (5%, n=10). In the studied collection of 180 isolates, cefepime resistant were 47.8% (n=86). Three isolates, resistant to 3rd generation cephalosporins were susceptible to cefepime. Carbapenem resistance in the whole collection was 3.3% (n=6). Conclusion: The high rates of 3rd generation cephalosporin resistance and ESBL production among clinically significant isolates of S. marcescens and the detection of carbapenem-resistant isolates are worrisome trends, because are associated with infections with very limited treatment alternatives and usually in immunocompromised patients.
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Resistance rates to 3rd generation cephalosporins and carbapenems in Serratia marcescens isolates obtained from various clinical samples from two Bulgarian hospitals
Published: 15 June 2022 by MDPI in The 2nd International Electronic Conference on Antibiotics—Drugs for Superbugs: Antibiotic Discovery, Modes of Action And Mechanisms of Resistance session Poster
Keywords: Antibiotic resistance; Resistance rates; 3rd generation cephalosporins; carbapenems; ESBL; S.marcescens ;