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Volume 12
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10.3390/antibiotics12060981
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Article

Antibiotic Susceptibility Patterns and Virulence-Associated Factors of Vancomycin-Resistant Enterococcal Isolates from Tertiary Care Hospitals

by
Arockia Doss Susai backiam
1,
Senbagam Duraisamy
2,
Palaniyandi Karuppaiya
2,
Senthilkumar Balakrishnan
3,
Balaji Chandrasekaran
4,
Anbarasu Kumarasamy
2 and
Amutha Raju
5,*
1
Department of Microbiology, Vivekanandha College of Arts and Science for Women (Autonomous), Tiruchengode 637303, India
2
Department of Marine Biotechnology, Bharathidasan University, Tiruchirappalli 620024, India
3
Division of Biological Sciences, Tamil Nadu State Council for Science and Technology, Chennai 600025, India
4
Irma Lerma Rangel School of Pharmacy, Texas A & M University, Kingsville, TX 77843, USA
5
Department of Biotechnology, Periyar University Centre for Post Graduate and Research Studies, Dharmapuri 635205, India
*
Author to whom correspondence should be addressed.
Antibiotics 2023, 12(6), 981; https://doi.org/10.3390/antibiotics12060981
Submission received: 18 April 2023 / Revised: 12 May 2023 / Accepted: 25 May 2023 / Published: 29 May 2023
(This article belongs to the Section The Global Need for Effective Antibiotics)
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Abstract

This study explored the prevalence of multi-drug resistance and virulence factors of enterococcal isolates obtained from various clinical specimens (n = 1575) including urine, blood, pus, tissue, catheter, vaginal wash, semen, and endotracheal secretions. Out of 862 enterococcal isolates, 388 (45%), 246 (29%), 120 (14%), and 108 (13%) were identified as Enterococcus faecalis, Enterococcus faecium, Enterococcus durans, and Enterococcus hirae, respectively, using standard morphological and biochemical methods. The antibiotic resistance profile of all these enterococcal isolates was checked using the disc diffusion technique. High-level resistance was observed for benzylpenicillin (70%) and vancomycin (43%) among E. faecalis and E. faecium isolates, respectively. This study also revealed the prevalence of ‘multi-drug resistance (resistant to 3 antibiotic groups)’ among the vancomycin-resistant enterococcal strains, and this was about 11% (n = 91). The virulence determinants associated with vancomycin resistance (VR) were determined phenotypically and genotypically. About 70 and 39% of E. faecalis and E. faecium isolates showed to be positive for all four virulence factors (gelatinase, protease, hemolysin, and biofilm). Among the several virulence genes, gelE was the most common virulence gene with a prevalence rate of 76 and 69% among E. faecalis and E. faecium isolates, respectively. More than 50% of VRE isolates harbored other virulence genes, such esp, asa, ace, and cylA. Similarly, the majority of the VR enterococcal isolates (n = 88/91) harbored vanA gene and none of them harbored vanB gene. These results disclose the importance of VR E. faecalis and E. faecium and the associated virulence factors involved in the persistence of infections in clinical settings.
Keywords: antibiotic resistance; vancomycin-resistant enterococcus; virulence factors; multi-drug resistance; gelatinase; protease; hemolysis; biofilm antibiotic resistance; vancomycin-resistant enterococcus; virulence factors; multi-drug resistance; gelatinase; protease; hemolysis; biofilm

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MDPI and ACS Style

Doss Susai backiam, A.; Duraisamy, S.; Karuppaiya, P.; Balakrishnan, S.; Chandrasekaran, B.; Kumarasamy, A.; Raju, A. Antibiotic Susceptibility Patterns and Virulence-Associated Factors of Vancomycin-Resistant Enterococcal Isolates from Tertiary Care Hospitals. Antibiotics 2023, 12, 981. https://doi.org/10.3390/antibiotics12060981

AMA Style

Doss Susai backiam A, Duraisamy S, Karuppaiya P, Balakrishnan S, Chandrasekaran B, Kumarasamy A, Raju A. Antibiotic Susceptibility Patterns and Virulence-Associated Factors of Vancomycin-Resistant Enterococcal Isolates from Tertiary Care Hospitals. Antibiotics. 2023; 12(6):981. https://doi.org/10.3390/antibiotics12060981

Chicago/Turabian Style

Doss Susai backiam, Arockia, Senbagam Duraisamy, Palaniyandi Karuppaiya, Senthilkumar Balakrishnan, Balaji Chandrasekaran, Anbarasu Kumarasamy, and Amutha Raju. 2023. "Antibiotic Susceptibility Patterns and Virulence-Associated Factors of Vancomycin-Resistant Enterococcal Isolates from Tertiary Care Hospitals" Antibiotics 12, no. 6: 981. https://doi.org/10.3390/antibiotics12060981

APA Style

Doss Susai backiam, A., Duraisamy, S., Karuppaiya, P., Balakrishnan, S., Chandrasekaran, B., Kumarasamy, A., & Raju, A. (2023). Antibiotic Susceptibility Patterns and Virulence-Associated Factors of Vancomycin-Resistant Enterococcal Isolates from Tertiary Care Hospitals. Antibiotics, 12(6), 981. https://doi.org/10.3390/antibiotics12060981

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