Article ; Online: Virulence, resistance genes, and transformation amongst environmental isolates of Escherichia coli and Acinetobacter spp.
Journal of microbiology and biotechnology
2012 Volume 22, Issue 1, Page(s) 25–33
Abstract: The association of verotoxic E. coli and Acinetobacter spp. with various antibiotic-resistant, diarrhogenic, and nosocomial infections has been a cause for concern worldwide. E. coli and A. haemolyticus isolated on a number of selective media were ... ...
| Abstract | The association of verotoxic E. coli and Acinetobacter spp. with various antibiotic-resistant, diarrhogenic, and nosocomial infections has been a cause for concern worldwide. E. coli and A. haemolyticus isolated on a number of selective media were screened for virulence factors, antibiotic resistance, and transformation of resistance genes. Out of 69 E. coli isolates obtained, 25 (35.23%), 14 (20.30%), and 28 (40.58%) were positive for Vtx1&2, Vtx1, and Vtx2, respectively, 49 (71.015%) for extendedspectrum beta-lactamases (ESBLs), 34 (49.28%) for serum resistance, 57 (82.61%) for cell surface hydrophobicity, 48 (69.57%) for gelatinase production, and 37 (53.62%) for hemolysin production. For the 14 A. haemolyticus isolates, only 2 (14.29%) in each case from all the samples investigated were positive for Vtx1, Vtx2 and Vtx1&2 respectively, 8 (57.14%) for ESBLs, 7 (50.00%) for serum resistance, 11 (78.57%) for cell surface hydrophobicity, 4 (28.57%) for gelatinase production, and 8 (57.14%) for hemolysin production. Although transformation occurred among the E. coli and Acinetobacter isolates (transformation frequency: 13.3 × 10(-7) -53.4(-7)), there was poor curing of the plasmid genes, a confirmation of the presence of stable antibiotic-resistant genes (DNA concentration between 42.7 and 123.8 microgram) and intragenetic transfer of multidrugresistant genes among the isolates. The isolates were potentially virulent and contained potentially transferable antibiotic resistance genes. Detection of virulence factors, antibiotic resistance genes, and transformation among these isolates is a very significant outcome that will influence approaches to proactive preventive and control measures and future investigations. However, continued surveillance for drug resistance among these bacteria and further investigation of the mechanism of action of their virulence factors are a necessity. |
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| MeSH term(s) | Acinetobacter/genetics ; Acinetobacter/isolation & purification ; Bacterial Toxins/genetics ; Bacterial Toxins/metabolism ; Blood Bactericidal Activity ; Cell Wall/chemistry ; Drug Resistance, Bacterial ; Environmental Microbiology ; Escherichia coli/genetics ; Escherichia coli/isolation & purification ; Gene Transfer, Horizontal ; Hydrophobic and Hydrophilic Interactions ; Plasmids ; Transformation, Bacterial ; Virulence Factors/genetics ; beta-Lactamases/metabolism |
| Chemical Substances | Bacterial Toxins ; Virulence Factors ; beta-Lactamases (EC 3.5.2.6) |
| Language | English |
| Publishing date | 2012-01-24 |
| Publishing country | Korea (South) |
| Document type | Journal Article ; Research Support, Non-U.S. Gov't |
| ISSN | 1738-8872 |
| ISSN (online) | 1738-8872 |
| DOI | 10.4014/jmb.1107.07029 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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