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Everything about mold
The indoor environment is contaminated by the products of microbial growth, such as spores, allergens, volatile organic compounds, endotoxins, mycotoxins and so on.
According to some estimates, between 10 and 50 per cent of indoor spaces across Asia, Australia, Europe and North America are affected to some degree by dampness. The presence of dampness in indoor spaces shows wide variations across different climate zones. The problem is more acute in the high-humidity conditions prevailing in areas close to the coast or in river valleys and basins.
Microorganisms are everywhere, but the availability of moisture in or on materials is particularly conducive to the propagation of a whole range of microbes, from fungi, to actinomycetes and other bacteria. In addition to these favorable conditions, dust provides an adequate supply of nutrients to sustain extensive microbial growth. Materials that retain moisture and accumulate dirt easily provide the optimal conditions for rapid growth of these organisms. As a result of this, the indoor environment is contaminated by the products of microbial growth, such as spores, allergens, volatile organic compounds, endotoxins, mycotoxins and so on. While it has not yet been possible to conclusively prove a causal relation between these products to adverse health effects, persons with atopic and allergic symptoms are hypersensitive to biological and chemical agents found in damp indoor conditions. Research is also bringing to light the detrimental effects of damp environments on atopic individuals as well. In this section, we will provide a brief summary of some important varieties of microorganisms known to be particularly active in damp indoor environments.