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Vásquez-Ponce F, Dantas K, Becerra J, Melocco G, Esposito F, Cardoso B, Rodrigues L, Lima K, de Lima AV, Sellera FP, Mattos R, Trevisoli L, Vianello MA, Sincero T, Di Conza J, Vespero E, Gutkind G, Sampaio J, Lincopan N. Detecting KPC-2 and NDM-1 Coexpression in Klebsiella pneumoniae Complex from Human and Animal Hosts in South America. Microbiol Spectr 2022; 10:e0115922. [PMID: 35980188 PMCID: PMC9604071 DOI: 10.1128/spectrum.01159-22] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 07/12/2022] [Indexed: 12/30/2022] Open
Abstract
Reports of Gram-negative bacteria harboring multiple carbapenemase genes have increased in South America, leading to an urgent need for appropriate microbiological diagnosis. We evaluated phenotypic methods for detecting Klebsiella pneumoniae carbapenemase 2 (KPC-2) and New Delhi metallo-β-lactamase-1 (NDM-1) coexpression in members of the K. pneumoniae complex (i.e., K. pneumoniae, K. quasipneumoniae, and K. variicola) isolated from human and animal hosts, based on inhibition of ceftazidime-avibactam (CZA) and aztreonam (ATM) by dipicolinic acid (DPA), EDTA, or avibactam (AVI). While the presence of blaKPC-2 and blaNDM-1 genes was confirmed by whole-genome sequencing, PCR, and/or GeneXpert, coexpression was successfully detected based on the following: (i) a ≥5-mm increase in the zone diameter of ATM (30 µg) disks plus AVI (4 or 20 µg) and ≥4-mm and ≥10-mm increases in the zone diameters for "CZA 50" (30 µg ceftazidime [CAZ] and 20 µg AVI) and "CZA 14" (10 µg CAZ and 4 µg AVI) disks, respectively, when we added DPA (1 mg/disk) or EDTA (5 mM) in a combined disk test (CDT); (ii) a positive ghost zone (synergism) between ATM (30 µg) and CZA 50 disks and between CZA 50 and DPA (1 mg) disks, using the double-disk synergy test (DDST) at a disk-disk distance of 2.5 cm; (iii) ≥3-fold MIC reductions of ATM and CZA in the presence of AVI (4 µg/mL), DPA (500 µg/mL), or EDTA (320 µg/mL); and (iv) immunochromatography. Although our results demonstrated that inhibition by AVI, DPA, and EDTA may provide simple and inexpensive methods for the presumptive detection of coexpression of KPC-2 and NDM-1 in members of the K. pneumoniae complex, additional studies are necessary to confirm the accuracy of these methodologies by testing other Gram-negative bacterial species and other KPC and NDM variants coexpressed by WHO critical priority pathogens detected worldwide. IMPORTANCE Alerts regarding the emergence and increase of combinations of carbapenemases in Enterobacterales in Latin America and the Caribbean have recently been issued by PAHO and WHO, emphasizing the importance of appropriate microbiological diagnosis and the effective and articulated implementation of infection prevention and control programs. In this study, we evaluated methods based on inhibition of ceftazidime (CAZ), ceftazidime-avibactam (CZA), and aztreonam (ATM) by dipicolinic acid (DPA), EDTA, and avibactam (AVI) inhibitors for the identification of KPC-2- and NDM-1-coexpression in members of the K. pneumoniae complex recovered from human and animal hosts. Our results demonstrate that inhibition by AVI, DPA, and EDTA may provide simple and inexpensive methods for the presumptive detection of coexpression of KPC-2 and NDM-1 in members of the K. pneumoniae complex.
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Affiliation(s)
- Felipe Vásquez-Ponce
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
| | - Karine Dantas
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
| | - Johana Becerra
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
| | - Gregory Melocco
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
| | - Fernanda Esposito
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
| | - Brenda Cardoso
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
| | - Larissa Rodrigues
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
| | - Keila Lima
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
| | - Aline V. de Lima
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
| | - Fábio P. Sellera
- Department of Internal Medicine, School of Veterinary Medicine and Animal Science, Universidade de São Paulo, São Paulo, Brazil
- School of Veterinary Medicine, Metropolitan University of Santos, Santos, Brazil
| | | | | | | | - Thais Sincero
- Department of Clinical Analysis, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Jose Di Conza
- Facultad de Farmacia y Bioquímica, Instituto de Investigaciones en Bacteriologia y Virología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Eliana Vespero
- Department of Pathology, Clinical and Toxicological Analysis, Health Sciences Center, University Hospital of Londrina, Paraná, Brazil
| | - Gabriel Gutkind
- Facultad de Farmacia y Bioquímica, Instituto de Investigaciones en Bacteriologia y Virología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Jorge Sampaio
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
- Fleury Medicine and Health, Microbiology Section, São Paulo, Brazil
| | - Nilton Lincopan
- Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
- Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
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Mohamed A, Daef E, Nafie A, Shaban L, Ibrahim M. Characteristics of Carbapenem-Resistant Gram-Negative Bacilli in Patients with Ventilator-Associated Pneumonia. Antibiotics (Basel) 2021; 10:antibiotics10111325. [PMID: 34827263 PMCID: PMC8615042 DOI: 10.3390/antibiotics10111325] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/25/2021] [Accepted: 10/27/2021] [Indexed: 01/16/2023] Open
Abstract
Carbapenem-resistant Gram-negative bacilli (CR-GNB) has become a global threat. In hospital settings, the association of CR-GNB with ventilator-associated pneumonia (VAP) is a critical public health concern owing to their high resistance rate to most antibiotics. The present study aims to identify the frequency of carbapenem-resistance and to determine the rate of multidrug resistance (MDR), extensive drug resistance (XDR) and pan-drug resistance (PDR) among CR-GNB infections in VAP. Antimicrobial susceptibility testing was carried out using the disk diffusion method and the detection of carbapenemases was screened using the imipenem-E test and the modified carbapenem-inactivation method (mCIM). The isolates were verified by polymerase chain reaction (PCR) for the presence of blaNDM, blaSPM, blaVIM, blaIMP and blaGIM genes. 89.5%, 14%, 17.5%, 10.5%, 3.5% of isolates exhibited the presence of blaNDM, blaVIM, blaSPM, blaIMP and blaGIM, respectively. 76%, 17% and 7% of isolates were PDR, XDR, and MDR, respectively. Carbapenem-resistance genes were identified in a significant percentage and blaNDM was the most predominant gene. All isolates were highly resistant to most antibiotics. This health concern has proven to be a big challenge in developing countries such as Egypt, as it is associated with high morbidity, high mortality, and raised healthcare costs.
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Affiliation(s)
- Amira Mohamed
- Clinical Pharmacy, Women’s Health Hospital, Assiut University, Assiut 71711, Egypt;
| | - Enas Daef
- Microbiology and Immunology Department, Faculty of Medicine, Assiut University, Assiut 71711, Egypt; (E.D.); (A.N.)
| | - Amany Nafie
- Microbiology and Immunology Department, Faculty of Medicine, Assiut University, Assiut 71711, Egypt; (E.D.); (A.N.)
| | - Lamia Shaban
- Chest Department, Faculty of Medicine, Assiut University, Assiut 71711, Egypt;
| | - Maggie Ibrahim
- Microbiology and Immunology Department, Faculty of Medicine, Assiut University, Assiut 71711, Egypt; (E.D.); (A.N.)
- Correspondence:
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