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Aspergillosis is an infection caused by Aspergillus, a common fungus that grows indoors
and outdoors. Most people breathe in Aspergillus spores on a daily basis without becoming unwell. However, in persons whose immune systems have been compromised by cancer treatment, bone marrow transplantation, or other immune-related condition, aspergillosis can quickly become invasive pulmonary aspergillosis (IPA or IA). This is the most severe type of aspergillosis, and it happens when the infection spreads quickly from the lungs to the brain, heart, kidneys, or skin. The most common cause of invasive pulmonary infection is
A. fumigatus, followed by A. flavus and A. terreus. If left untreated, invasive aspergillosis
can be lethal.