Abstract
Microorganisms can cause adverse human health effects and deterioration of building materials when they proliferate in indoor environments (1). While all types of microorganisms can cause problems indoors, bacteria and fungi are most commonly associated with indoor air quality complaints. Bacteria are generally found growing indoors in areas with standing water such as water spray and condensation areas of airhandling system components. Fungi, which have lower water activity (A,,,) requirements than bacteria, tend to colonize a wide variety of building materials wetted from floods, condensation, or plumbing leaks. When microbial amplification occurs, the indoor environment becomes a source of exposure to the occupants, especially when the organisms and/or their by-products are released into the air as bioaerosols (2).
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