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Species-specific detection of medically important aspergilli by a loop-mediated isothermal amplification method in chronic pulmonary aspergillosis.

Medical Mycology 2019 January 13
Chronic pulmonary aspergillosis (CPA) is a common subtype of pulmonary aspergillosis and a life-threatening disease. However, its diagnosis remains difficult due to the lack of specific clinical features and radiologic findings, as well as the difficulty of isolating Aspergillus spp. We developed a novel species-specific detection method of medically important aspergilli using a loop-mediated isothermal amplification (LAMP) for CPA. Specific LAMP primer sets for Aspergillus fumigatus, Aspergillus flavus, Aspergillus niger, Aspergillus terreus, and Aspergillus nidulans were designed. The use of the LAMP assay was validated using respiratory specimens (CPA cases, n = 21; nonaspergillosis cases, n = 23). A total of 15 cases were positive in the CPA group (A. fumigatus, n = 5; A. flavus, n = 1; A. niger, n = 1; A. terreus, n = 7; A. nidulans, n = 1), but only three in the non-CPA group (A. niger, n = 2; A. terreus n = 1). The sensitivity and specificity of the diagnosis of CPA by the LAMP system were 71.4% and 87.0%, respectively. In conclusion, we developed a species-specific detection approach for five medically important aspergilli using the LAMP method. The system showed high sensitivity and specificity for diagnosis of CPA.

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