Aspergillosis is disease caused by Aspergillus, a type of fungus.
Aspergillus is a fungus. Aspergillosis is disease linked to this fungus, but the term includes different forms. An allergic form is an immune reaction to the fungus. In invasive aspergillosis, the fungus spreads into body tissue. These are different clinical problems.
Invasive aspergillosis is more likely when the immune system is weakened. A laboratory finding, allergy, and invasive infection therefore should not be treated as interchangeable. The diagnosis depends on the form being investigated and the wider clinical assessment.

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