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Updated: Jul 22, 2026

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA
Published on: May 2, 2018
Factors of importance in determining the prevalence of indoor molds
Abstract:
The concentration of molds isolated in 68 homes of allergic patients in southern California using the Andersen volumetric sampler varied from a minimum of 36 to a maximum of 5,984 isolate/M3 air sampled. The most frequently isolated included Cladosporium, Penicillium species. Alternaria, Sterile (Non-sporulating) Mycelium, Epicoccum, Aspergillus species, Aureobasidium and Dreschlera. Statistically significant higher mold isolates were associated with high shade and high levels of organic debris near the home and poor landscaping and landscape maintenance. Low concentrations of mold isolates were associated with the presence of a central electrostatic filtration system and good compliance with dust controls. The viable mold spore levels were lower in homes where the electrostatic filtration unit was operated continuously rather than intermittently. No statistically significant correlations could be made between indoor mold isolates and any of the following: number and age of the occupants, age and size of home, month of survey or the presence of indoor plants.
Insights
Indoor mold concentrations in allergic patients
Area of Science:
- Environmental microbiology
- Allergen exposure assessment
Background:
- Mold exposure is a significant factor for allergic patients.
- Understanding indoor mold levels is crucial for managing allergic conditions.
Purpose of the Study:
- To quantify indoor mold concentrations in homes of allergic patients.
- To identify environmental factors associated with elevated mold levels.
Main Methods:
- Utilized Andersen volumetric samplers to collect air samples from 68 homes.
- Identified and quantified mold isolates, including common genera like Cladosporium and Penicillium.
Main Results:
- Mold concentrations ranged from 36 to 5,984 isolates/M3.
- Higher mold levels correlated with shade, organic debris, and poor landscape maintenance.
- Lower mold levels were linked to electrostatic filtration systems and dust control compliance.
Conclusions:
- Environmental factors like landscaping and debris significantly impact indoor mold levels.
- Electrostatic filtration and dust control measures can reduce mold spore exposure for allergic individuals.
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