Comparison of Year Round Outdoor and Indoor Fungal Spore Count in Kansas City

David A. Jara, MD, Jay M. Portnoy, Minati Dhar, Ph.D, Charles S. Barnes, PhD



Fungus has consistently been shown to exist both outdoors and indoors. Fungal exposure has been shown to increase risk of respiratory disease in atopic patients. To determine if the indoor mold count correlated in relation to outdoor seasonal mold counts in the Kansas City area we conducted the following study.



For the years 2008-2011 homes of persons enrolled in the Kansas City Safe and Healthy Homes Study. Homes were evaluated for indoor airborne spore concentrations for at least 2 rooms and for outdoor concentrations for at least one location per home. Spores were collected using a portable spore trap device and enumerated visually by a NAB Certified counter for total spores and for 23 identifiable taxa. Data was stored and analyzed on an excel spreadsheet.



A total of 382 homes were observed over the period. Cladosporium was the most common collected outdoor spore while Aspergillus was the most common indoor spore seen. The highest outdoor spore count was noted between June-August. The lowest count was in December-February. The highest indoor count was noted in September-November and the lowest was noted in December-February. Most fungi had little variation indoors except for Aspergillus/Penicillium which was noted to increase during September-November months. There was no significant correlation between outdoor and indoor peaks of mold counts.



There was no significant correlation which may be due to minimal variation of indoor spore count in comparison to outdoor variation. Aspergillus/Penicillum was counted more indoors when compared to outdoor counts, which could be secondary to environmental susceptibility.

abstract No: 

    • AAAAI 2015 (71st)