Higher environmental relative moldiness index values measured in homes of adults with asthma, rhinitis, or both conditions

Higher values of the environmental relative moldiness index (ERMI), a DNA-based method for quantifying indoor molds, have been associated with asthma in children. In this study, settled dust samples were collected from the homes of adults with asthma, rhinitis, or both conditions (n=139 homes) in Northern California. The ERMI values for these samples were compared to those from dust collected in homes from the same geographic region randomly selected as part of the 2006 American Healthy Home Survey (n=44). The median ERMI value in homes of adult with airway disease (6) was significantly greater than median ERMI value (2) in the randomly selected homes (p<0.0001). In this study in Northern California, the homes of adults with asthma had ERMI values consistent with a heavier burden of indoor mold than that measured in other homes from the same region.

► Higher values of the ERMI mold index indicate more abundant indoor mold associated with damp environments.
► Homes of adults with asthma, rhinitis, or both conditions in Northern California had higher ERMI values than a comparison sample.
► These findings are particularly relevant to potential sources of symptom exacerbation.