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Year : 2020  |  Volume : 38  |  Issue : 2  |  Page : 183-191

Molecular characterisation of methicillin-resistant Staphylococcus aureus isolated from patients at a tertiary care hospital in Hyderabad, South India

1 Department of Microbiology, Gandhi Medical College and Hospital, Secunderabad, Telangana, India
2 Ella Foundation, Genome Valley, Turkapally, Shameerpet Mandal, Telangana, India
3 National Institute of Animal Biotechnology, Hyderabad, Telangana, India
4 Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, Maharashtra, India
5 Division of Veterinary Public Health, ICAR Research Complex for Goa, Old Goa, Goa, India

Correspondence Address:
Dr. Nagendra R Hegde
National Institute of Animal Biotechnology, Opposite Journalist Colony, Extended Q City Road, Near Gowlidoddi, Gachibowli, Hyderabad - 500 032, Telangana
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijmm.IJMM_20_151

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Context: Infections with methicillin-resistant Staphylococcus aureus (MRSA) greatly influence clinical outcome. Molecular characterisation of MRSA can help to predict their spread and to institute treatment and hospital protocols. Aim: The aim of this study is to understand the diversity of MRSA in a tertiary care hospital in Hyderabad, India. Settings and Design: Samples collected at Gandhi Medical College, Hyderabad, and designed to assess hospital-or community-associated MRSA (HA-MRSA or CA-MRSA). Subjects and Methods: MRSA were subjected to antibiotic susceptibility testing, pulsed-field gel electrophoresis (PFGE), spa typing, multi-locus sequence typing and staphylococcal cassette chromosome–mec (SCCmec) typing. Statistical Analysis Used: Discriminatory index and 95% confidence interval. Results: Of the 30 MRSA, (a) 18 and 12 were HA-MRSA and CA-MRSA, respectively, and (b) 23.3% and 6.6% displayed induced clindamycin and intermediate vancomycin resistance, respectively. Genetic diversity was evident from the presence of (a) 20 pulsotypes, (b) eight spa types, with the predominance of t064 (n = 9) and (c) seven sequence types (ST), with the preponderance of ST22 and ST8 (9 each). ST22 and ST8 were the most prevalent among HA-MRSA and CA-MRSA, respectively. SCCmec type IV was the most frequent (n = 8). 44.4% of HA-MRSA belonged to SCCmec IV and V, whereas 33.3% of CA-MRSA belonged to SCCmec I and III; 33.3% (5/15) of the isolates harbouring the pvl gene belonged to SCCmec IVC/H. Conclusions: ST8 was a dominant type along with other previously reported types ST22, ST239, and ST772 from India. The observations highlight the prevalence of genetically diverse clonal populations of MRSA, suggesting potential multiple origins.


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2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

Online since April 2001, new site since 1st August '04