Extended-spectrum β-lactamase-producing Shigella strains in Israel, 2000–2004 |
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Authors: | V Vasilev R Japheth R Yishai N Andorn L Valinsky S Navon-Venezia I Chmelnitsky Y Carmeli D Cohen |
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Institution: | (1) Central Laboratories of the Ministry of Health, 9 Yaakov Eliav Street, P.O. Box 34410, Givat Shaul, Jerusalem, 91342, Israel;(2) Division of Epidemiology, Tel Aviv Sourasky Medical Center, 9 Weizmann Street, Tel Aviv, 64239, Israel;(3) Department of Epidemiology and Preventive Medicine, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Tel Aviv, 69978, Israel |
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Abstract: | Routine susceptibility testing of 5,616 Shigella isolates at the National Shigella Reference Centre in Israel over a 5-year period (2000–2004) revealed resistance to ceftriaxone
in one strain of Shigella boydii 2 and in two strains each of Shigella flexneri 2a, S. flexneri 6, and Shigella sonnei. All seven isolates were confirmed as producers of extended-spectrum β-lactamase (ESBL) by the combination disk method, the
Vitek 1 system, and a modification of the double-disk synergy test, which is based on the inhibitory properties of clavulanic
acid, tazobactam, and sulbactam. Tazobactam had the strongest effect in all seven strains. Molecular characterization of the
ESBLs identified CTX-M-type enzymes, consisting of the CTX-M-9 group (n = 3), CTX-M-3 (n = 2), CTX-M-39 (n = 1), and CTX-M-2 group (n = 1). Three of the strains also carried bla-OXA genes and a bla-TEM gene. Although the prevalence of ESBLs in this study was low, further research is needed on the spread and transfer of resistance
genes, both in hospitals and in the community. |
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