What Is Aspergillosis
Aspergillosis is a respiratory infection caused by inhaling spores from Aspergillus mold species. The infection develops when mold spores reach the lungs and establish themselves in lung tissue, triggering an immune response. This differs from simple mold exposure, which most people tolerate without issue. Aspergillosis requires both significant mold presence and a compromised or reactive immune system to develop.
Types and Health Effects
Three main forms of aspergillosis affect people exposed to contaminated indoor environments:
- Allergic bronchopulmonary aspergillosis (ABPA): Occurs when the immune system overreacts to Aspergillus spores. Symptoms include persistent cough, wheezing, and fever. People with asthma or cystic fibrosis face elevated risk.
- Chronic pulmonary aspergillosis: A long-term infection typically seen in people with pre-existing lung damage or immunocompromised status. Can progress over months or years if untreated.
- Invasive aspergillosis: The most serious form, occurring primarily in severely immunocompromised patients such as those undergoing chemotherapy or organ transplant recipients. This requires immediate medical intervention.
Connection to Mold Inspection and Remediation
Aspergillosis risk directly correlates with indoor mold levels and duration of exposure. The EPA does not establish a specific "safe" threshold for Aspergillus, but inspection protocols typically involve air sampling and surface testing to quantify spore counts. Labs analyze samples using culture methods or PCR testing, which identifies Aspergillus species and concentration.
Remediation follows EPA guidelines outlined in the "Mold Remediation in Schools and Commercial Buildings" document. For areas larger than 10 square feet, professional remediation is recommended. The process includes identifying moisture sources, containing affected areas, removing contaminated materials, and decontaminating surfaces with HEPA-filtered equipment. Moisture control is critical, as Aspergillus thrives in environments above 60 percent humidity. Installing dehumidifiers, improving ventilation, and addressing water intrusion prevent recurrence.
When to Test and Seek Help
If household members experience unexplained respiratory symptoms such as persistent cough, shortness of breath, or chest pain coinciding with visible mold, professional mold testing is warranted. People with asthma, cystic fibrosis, or compromised immune systems living in moldy environments face higher risk and should prioritize inspection and remediation. A pulmonary function test or chest X-ray ordered by a physician can help confirm aspergillosis alongside mold testing data.
Common Questions
- Can I get aspergillosis from a small amount of mold in my home? Occasional exposure to household mold rarely causes aspergillosis in healthy individuals. Risk increases with sustained exposure, high spore concentrations, and a weakened immune system. Testing quantifies the actual hazard level.
- What humidity level prevents Aspergillus growth? Keeping indoor humidity below 50 percent substantially slows Aspergillus and other mold growth. Using a hygrometer to monitor humidity and running dehumidifiers during humid months is practical prevention.
- How long does remediation take? Small contaminated areas may be cleaned in a day, while extensive mold remediation in commercial buildings can take weeks. The timeline depends on contamination size, material type, and extent of moisture damage requiring repair.