Revealing Stachybotrys-like fungal growth in buildings - Possible exposure highlighted through three case studies

Area of Science:

• Mycology
• Environmental Health
• Building Science

Background:

• Stachybotrys, a mold genus thriving in high humidity, is frequently implicated in building-related illnesses.
• Its presence in indoor dust can signal hidden water damage and mold infestations within building structures.

Purpose of the Study:

• To develop a method for detecting Stachybotrys growth concealed within building structures.
• To investigate the health impacts of Stachybotrys exposure, specifically focusing on asthma development and prognosis.

Main Methods:

• A novel microscopic screening technique was developed to concentrate Stachybotrys conidia from settled dust using saturated NaCl solution.
• Conidia were identified morphologically, and isolates were further classified to species or genus level.
• Case studies of two individuals with asthma following Stachybotrys exposure were analyzed.

Main Results:

• Stachybotrys growth was successfully detected within the structures of three Finnish buildings.
• Two individuals developed asthma after prolonged exposure to Stachybotrys; one case resolved, while the other became chronic occupational asthma.
• Environmental microbial diversity and activity were proposed as potential factors influencing asthma outcomes.

Conclusions:

• The developed method enables the detection of hidden Stachybotrys infestations.
• Stachybotrys exposure is a significant risk factor for developing asthma, which can become chronic.
• Environmental microbial exposures may play a role in the differing prognoses of occupationally acquired asthma.