Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study
Background and Objectives: Carbapenem-resistant Enterobacterales (CRE) pose a major healthcare challenge due to high resistance rates and limited treatment options. This study characterized carbapenemase production among CRE isolates using phenotypic methods—Modified Carbapenem Inactivation Method (...
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2025-07-01
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| Series: | Iranian Journal of Microbiology |
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| Online Access: | https://ijm.tums.ac.ir/index.php/ijm/article/view/4966 |
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| author | Touseefa Shafi Anjum Ara Mir Shagufta Roohi Bashir Fomda Sanam Rasool Wani Tufail Ahmed Samiah Yousuf |
| author_facet | Touseefa Shafi Anjum Ara Mir Shagufta Roohi Bashir Fomda Sanam Rasool Wani Tufail Ahmed Samiah Yousuf |
| author_sort | Touseefa Shafi |
| collection | DOAJ |
| description | Background and Objectives: Carbapenem-resistant Enterobacterales (CRE) pose a major healthcare challenge due to high resistance rates and limited treatment options. This study characterized carbapenemase production among CRE isolates using phenotypic methods—Modified Carbapenem Inactivation Method (mCIM) and EDTA-Carbapenem Inactivation Method (eCIM)—as genotypic methods have limitations like restricted gene targets and mutations.
Materials and Methods: This six-month study was conducted at Sher-i-Kashmir Institute of Medical Sciences (SKIMS). Samples including swabs, respiratory specimens, pus, body fluids, and blood were cultured on Blood Agar and MacConkey Agar (HiMedia, India). Enterobacterales were identified using conventional methods and screened for carbapenem resistance. CRE isolates underwent mCIM and eCIM testing per CLSI guidelines.
Results: Among 471 Enterobacterales isolates tested, 160 (33.9%) were carbapenem-resistant. Of these, 97 (60.6%) were mCIM positive, indicating carbapenemase production. eCIM further identified 83 (85.5%) as metallo-beta-lactamase (MBL) producers and 14 (14.4%) as serine carbapenemase producers. CRE prevalence was higher in ICU settings and among males. Isolates showed high cephalosporin resistance, with multi-drug resistance (MDR) common in both MBL and serine carbapenemase producers.
Conclusion: The prevalence of CRE was found to be 33.9%. The findings underscore the critical need for continuous surveillance and stringent infection control measures to manage the spread of CRE in healthcare settings.
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| format | Article |
| id | doaj-art-e33f95e205434474912c7503b5ac72bf |
| institution | Kabale University |
| issn | 2008-3289 2008-4447 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | Iranian Journal of Microbiology |
| spelling | doaj-art-e33f95e205434474912c7503b5ac72bf2025-08-20T03:41:22ZengTehran University of Medical SciencesIranian Journal of Microbiology2008-32892008-44472025-07-0117410.18502/ijm.v17i4.19227Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital studyTouseefa Shafi0Anjum Ara Mir1Shagufta Roohi2Bashir Fomda3Sanam Rasool Wani4Tufail Ahmed5Samiah Yousuf6Department of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaDepartment of Microbiology, Sher-i-Kashmir Institute of Medical Sciences, Soura, Jammu & Kashmir, IndiaBackground and Objectives: Carbapenem-resistant Enterobacterales (CRE) pose a major healthcare challenge due to high resistance rates and limited treatment options. This study characterized carbapenemase production among CRE isolates using phenotypic methods—Modified Carbapenem Inactivation Method (mCIM) and EDTA-Carbapenem Inactivation Method (eCIM)—as genotypic methods have limitations like restricted gene targets and mutations. Materials and Methods: This six-month study was conducted at Sher-i-Kashmir Institute of Medical Sciences (SKIMS). Samples including swabs, respiratory specimens, pus, body fluids, and blood were cultured on Blood Agar and MacConkey Agar (HiMedia, India). Enterobacterales were identified using conventional methods and screened for carbapenem resistance. CRE isolates underwent mCIM and eCIM testing per CLSI guidelines. Results: Among 471 Enterobacterales isolates tested, 160 (33.9%) were carbapenem-resistant. Of these, 97 (60.6%) were mCIM positive, indicating carbapenemase production. eCIM further identified 83 (85.5%) as metallo-beta-lactamase (MBL) producers and 14 (14.4%) as serine carbapenemase producers. CRE prevalence was higher in ICU settings and among males. Isolates showed high cephalosporin resistance, with multi-drug resistance (MDR) common in both MBL and serine carbapenemase producers. Conclusion: The prevalence of CRE was found to be 33.9%. The findings underscore the critical need for continuous surveillance and stringent infection control measures to manage the spread of CRE in healthcare settings. https://ijm.tums.ac.ir/index.php/ijm/article/view/4966Carbapenem antibioticsCarbapenemasesBeta-lactamasesMetallo-beta-lactamaseMicrobial sensitivity tests |
| spellingShingle | Touseefa Shafi Anjum Ara Mir Shagufta Roohi Bashir Fomda Sanam Rasool Wani Tufail Ahmed Samiah Yousuf Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study Iranian Journal of Microbiology Carbapenem antibiotics Carbapenemases Beta-lactamases Metallo-beta-lactamase Microbial sensitivity tests |
| title | Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study |
| title_full | Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study |
| title_fullStr | Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study |
| title_full_unstemmed | Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study |
| title_short | Detection of carbapenemase production in Enterobacterales by mCIM and eCIM: a tertiary care hospital study |
| title_sort | detection of carbapenemase production in enterobacterales by mcim and ecim a tertiary care hospital study |
| topic | Carbapenem antibiotics Carbapenemases Beta-lactamases Metallo-beta-lactamase Microbial sensitivity tests |
| url | https://ijm.tums.ac.ir/index.php/ijm/article/view/4966 |
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