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The article offers clinical information on invasive aspergillosis (IA), an invasive disease marked by acute progressive infection and often leads to death. Tissue biopsy is used to diagnose IA. Another diagnostic test that can be used for IA is the galactomannan (GM) antigen assay. GM assay was initially developed for serum samples, but studies revealed that it can also test other body fluids. The author notes that GM assay is efficient for the early diagnosis of IA.