ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
D. Bindu and Chitralekha Saikumar
Deparment of Microbiology, Sree Balaji Medical College and Hospital, Chrompet, Chennai, Tamil Nadu, India.
Article Number: 7778 | © The Author(s). 2022
J Pure Appl Microbiol. 2022;16(4):2783-2790.
Received: 21 April 2022 | Accepted: 01 September 2022 | Published online: 17 November 2022
Issue online: December 2022

AmpC β-lactamases are enzymes that are resistant to β-lactams, such as penicillin and cephalosporin, but not cefoxitin and cefotetan. This study was conducted to characterize AmpC β-lactamases in Enterobacteriaceae. This study included 200 cephalosporin-resistant Gram-negative isolates recovered from different samples between January 2015 and December 2016. The isolates were subjected to phenotypic tests, and those that tested positive were further analyzed by PCR for six AmpC genotypes: ACC, DHA, FOX, CIT, MOX, and EBC. Among the 200 strains, 32% (64) were positive for AmpC β-lactamases by different phenotypic methods. The target genotypes were detected in 20 (10%) of the isolates. Pus was the predominant source of AmpC isolates. Klebsiella pneumoniae (55%) was the most common producer of AmpC β-lactamase. CIT-FOX was the predominant gene type. As there is variation in the prevalence of AmpC β-lactamases in different geographic regions, periodic surveillance and measures to control infection can prevent the spread of these genes.


AmpC β-lactamases, AmpC Disk Test, Antibiotic Resistance

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© The Author(s) 2022. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.