1887

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Volume 63, Issue 7

Detection of TEM-, SHV- and CTX-M-type β-lactamase production among clinical isolates of species Free

Abstract

Enteric fever is a major public health problem in developing countries. Due to the problem of resistance to first-line drugs and fluoroquinolone, cephalosporins are currently used for treatment of enteric fever. Cephalosporin resistance in spp. is mainly due to production of extended-spectrum β-lactamases (ESBLs). The majority of ESBLs in are derivatives of the TEM and SHV β-lactamase families. The objectives of this study were to detect antibiotic susceptibility patterns, ESBL production and TEM-, SHV- and CTX-M-encoding genes ( , and ) among clinical isolates of spp. A total of 134 isolates [ Typhi ( = 101), Paratyphi A ( = 31), Paratyphi B ( = 1) and Typhimurium ( = 1)] were included in this study. Multidrug resistance was seen in 5/134 (3.73 %) isolates, all of which belonged to serotype . Typhi. A better susceptibility profile was observed for first-line drugs (ampicillin, chloramphenicol, co-trimoxazole and tetracycline) and cephalosporins (cefotaxime, ceftazidime, ceftriaxone, cefixime and cefepime). However, 131 (97.76 %) of the 134 isolates were resistant to nalidixic acid and one (0.75 %) was resistant to ciprofloxacin. TEM-1-type β-lactamase ( ) was detected in six (4.47 %) of the 134 isolates, which belonged to the serotype . Typhi. All six TEM-positive isolates were negative for the gene and none of the isolates was positive for the gene. The presence of the gene encoding TEM-1 β-lactamase is believed to confer resistance only to penicillins and early cephalosporins; however, the resistance spectrum of TEM-1 descendants may extend to second-, third- and fourth-generation cephalosporins. The ESBLs derived from TEM-1 differ from their progenitors by as few as 1 aa, and have the ability to hydrolyse third-generation cephalosporins. Therefore, appropriate selection and rotation of antibiotics as well as continuous monitoring of antibiotic susceptibility profiles could help to control the emergence and spread of resistant strains.

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© 2014 The Authors
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2014-07-01
2024-04-23
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Detection of TEM-, SHV- and CTX-M-type β-lactamase production among clinical isolates of Salmonella species
J. Med. Microbiol. 63, 962 (2014); https://doi.org/10.1099/jmm.0.068486-0
/content/journal/jmm/10.1099/jmm.0.068486-0
/content/journal/jmm/10.1099/jmm.0.068486-0
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