Design of two molecular methodologies for the rapid identification of Colombian community-acquired methicillin-resistant Staphylococcus aureus isolates
Abstract
Introduction. Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) infections are found with increasing the frequency, both in healthy individuals in the community and in hospitalized patients. In Colombia and the Andean region, CA-MRSA isolates have a genetic background that is related to the pandemic USA300 clone.
Objective. Two molecular methods are designed and standardized for the rapid differentiation of Colombian community-acquired and hospital-acquired methicillin-resistant Staphylococcus aureus (HA-MRSA) isolates.
Materials and methods. Two molecular methods were standardized for the identification of CA-MRSA isolates. The first method was based on the differential digestion of the carbamate kinase (arcC) and guanylate kinase (gmk) genes in the sequences type 5 (ST5) in the HA-MRSA isolates and 8 (ST8) in the CA-MRSA isolates. The second method was based on the PCR amplification of 5 specific virulence factors found in CA-MRSA and HA-MRSA isolates. The specificity and precision of each method wereevaluated using 237 clinical MRSA isolates.
Results. The first method identified 100% and 93.2% of the CA-MRSA and HA-MRSA isolates, respectively. The second method also correctly identified the two isolates types (CA-MRSA and HAMRSA).
Conclusions. These two methods are a convenient alternative for the rapid identification of the CAMRSA isolates, compared with other techniques such as pulsed field gel electrophoresis and multilocus sequence typing, which are time-consuming and more expensive.
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References
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