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Causes
By Mayo Clinic staffAspergillus mold is virtually unavoidable. Outdoors, it's found in decaying leaves and compost and on plants, trees and grain crops. Inside, the spores — the reproductive parts of mold — thrive in air conditioning and heating ducts, insulation, carpeting, ornamental plants, tap water, dust and food — especially ground pepper and other spices.
Everyday exposure to aspergillus is rarely a problem for people with healthy immune systems. When mold spores are inhaled, immune system cells simply surround and destroy them. But people who have a weakened immune system from illness or immunosuppressant medications have fewer infection-fighting cells. This allows aspergillus to take hold, invading the lungs, and in the most serious cases, other parts of the body.
Aspergillosis is not contagious.
- Stevens DA. Aspergillosis. In: Goldman L, et al., eds. Cecil Medicine. 23rd ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/126486890-3/0/1492/0.html. Accessed March 15, 2009.
- Aspergillosis. Centers for Disease Control and Prevention. http://www.cdc.gov/nczved/dfbmd/disease_listing/aspergillosis_gi.html. Accessed March 15, 2009.
- Davies SF, et al. Fungal infections. In: Mason RJ, et al. Murray & Nadel's Textbook of Respiratory Medicine. 4th ed. St. Louis, Mo.: W.B. Saunders; 2005. http://www.mdconsult.com/das/book/body/126486890-4/817667210/1288/304.html#4-u1.0-B0-7216-0327-0..50037-9--cesec55_2038. Accessed March 15, 2009.
- Handa S. Aspergillosis. In: Ferri FF. Ferri's Clinical Advisor 2009. St. Louis, Mo.: Mosby; 2008. http://www.mdconsult.com/das/book/body/126486890-5/817668274/1701/64.html#4-u1.0-B978-0-323-04134-8..50004-5--subchapter59_1265. Accessed March 15, 2009.
- Rosenow EC (expert opinion). Mayo Clinic, Rochester, Minn. March 20, 2009.
