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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
Prevalence and genotype distribution of methicillin-resistant Staphylococcus aureus (MRSA) in India
Raju Sunagar1, Nagendra Ramachandra Hegde1, Ganapuram Jagadishwar Archana2
1Ella Foundation, Genome Valley, Turkapally, Shameerpet Mandal, Hyderabad 500078, India.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) is a serious human pathogen that can cause a wide variety of infections. Comparative genetic analyses have led to the discovery that despite the existence of a vast number of genotypes, outbreak strains of MRSA appear to be limited to certain genotypes, some of which are further restricted to certain geographical locations. Whereas extensive literature is available in several countries, the complexity of the clonal distribution both of healthcare-associated (HA) and community-associated (CA) MRSA in India is only now beginning to be understood. Studies have revealed that MRSA in India is distributed among all of the major staphylococcal cassette chromosome mec (SCCmec) types. The majority of HA-MRSA isolates belong to SCCmec type III and sequence type (ST) 239. By contrast, CA-MRSA mostly belong to ST22 (SCCmec IV), ST772 (SCCmec V) and ST672 (SCCmec V) genotypes. Similar to the global scenario, CA-MRSA is becoming more invasive and transmissible and is increasingly becoming difficult to be differentiated from HA-MRSA. In addition, it is disturbing that some of the HA-MRSA isolates have been reported to be vancomycin-resistant. On the other hand, almost no information is available on the genotypes of livestock-associated MRSA or their potential impact on human infections in India. Concerted efforts are needed to further understand the genetic epidemiology of MRSA in India.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) in India shows diverse genotypes, with distinct types dominating healthcare-associated (HA-MRSA) and community-associated (CA-MRSA) infections. Understanding these MRSA genetic patterns is crucial for effective control.
Area of Science:
- Microbiology
- Epidemiology
- Genetics
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen causing diverse infections globally.
- While extensive MRSA literature exists, the clonal distribution of healthcare-associated (HA-MRSA) and community-associated (CA-MRSA) strains in India is under-researched.
- MRSA genotypes are known to be geographically restricted, influencing outbreak patterns.
Purpose of the Study:
- To elucidate the genetic epidemiology of MRSA in India.
- To differentiate the clonal distribution of HA-MRSA and CA-MRSA in the Indian context.
- To identify prevalent MRSA genotypes and their associated sequence types (STs) and staphylococcal cassette chromosome mec (SCCmec) types in India.
Main Methods:
- Comparative genetic analyses of MRSA isolates.
- Review of existing literature on MRSA prevalence and genotypes in India.
- Analysis of staphylococcal cassette chromosome mec (SCCmec) types and sequence types (STs) associated with MRSA.
Main Results:
- MRSA in India encompasses all major staphylococcal cassette chromosome mec (SCCmec) types.
- Healthcare-associated MRSA (HA-MRSA) predominantly belongs to SCCmec type III and sequence type (ST) 239.
- Community-associated MRSA (CA-MRSA) is mainly associated with ST22 (SCCmec IV), ST772 (SCCmec V), and ST672 (SCCmec V).
- CA-MRSA is increasing in invasiveness and transmissibility, blurring lines with HA-MRSA.
- Some HA-MRSA isolates exhibit vancomycin resistance.
- Data on livestock-associated MRSA in India is notably absent.
Conclusions:
- MRSA in India exhibits a complex clonal distribution, with distinct genotypes for HA-MRSA and CA-MRSA.
- The increasing invasiveness of CA-MRSA and emerging vancomycin resistance in HA-MRSA pose significant public health challenges.
- Further research is imperative to understand the genetic epidemiology of MRSA in India, including livestock-associated strains.
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