Molecular biological methods for the detection and characterisation of microorganisms have revolutionised diagnostic microbiology and are now part of routine specimen processing. In addition to detection of fastidious microorganisms, more rapid detection by molecular methods is now possible for pathogens of public health importance. Molecular methods have now progressed beyond identification to detect antimicrobial resistance genes and provide public health information such as strain characterisation by genotyping. Treatment of certain microorganisms has been improved by viral resistance detection and viral load testing for the monitoring of responses to antiviral therapies.
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