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Hemoculture and Direct Sputum Detection of mecA-Mediated Methicillin-Resistant Staphylococcus aureus by Loop-Mediated Isothermal Amplification in Combination With a Lateral-Flow Dipstick.
Journal of Clinical Laboratory Analysis 2016 September
This study reports loop-mediated isothermal amplification (LAMP) for rapid detection of methicillin-resistant Staphylococcus aureus from direct clinical specimens. Four primers including outer and inner primers were specifically designed on the two target sequences-femB to identify S. aureus and mecA to identify antibiotic-resistant gene. Reference strains including various species of gram-positive/gram-negative isolates were used to evaluate and optimize LAMP assays. The optimum LAMP condition was found at 63°C within 70 min assay time (include hybridization with FITC probe for 5 min and further 5 min for reading the results on the lateral flow dipstick). The detection limits of LAMP for mecA was 10 pg of total DNA or 100 CFU/ml. The LAMP assays were applied to a total of 155 samples of direct DNA extraction from sputum and hemoculture bottles. The sensitivity of LAMP for mecA detection in sputum and hemoculture bottles was 93.3% (28/30) and 100% (52/52), respectively. In conclusion, LAMP assay is an alternative technique for rapid detection of MRSA infection with a technical simplicity and cost-effective method in a routine diagnostic laboratory.
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