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General terms  
An allergen is a substance that elicits an IgE antibody response and is responsible for
producing allergic reactions. Chemicals are released when IgE on certain cells come into
contact with an allergen. These chemicals can cause injury to surrounding tissue - the
visible signs of an allergy. Only a few fungal allergens have been characterized but all
fungi are thought to be potentially allergenic. Fungal allergens are proteins found in
either the mycelium or spores
"Black mold"
The poorly defined term? Black mold? Or? Toxic black mold? Has usually been
associated with the mold Stachybotrys chartarum. While there are only a few molds that
are truly black, there are many that can appear black. Not all molds that appear to be
black are Stachybotrys.
Fungi are neither animals nor plants and are classified in a kingdom of their own? The
Kingdom of Fungi. Fungi include a very large group of organisms, including molds,
yeasts, mushrooms and puffballs. There are >100,000 accepted fungal species but current
estimates range to 1.5 million species. Mycologists (people who study fungi) have
grouped fungi into four large groups according to their method of reproduction.
Hidden mold
This refers to visible mold growth on building structures that is not easily seen, including
the areas above drop ceilings, within a wall cavity (the space between the inner and outer
structure of a wall), inside air handlers, or within the ducting of a heating/ventilation
Microbial Volatile Organic Compounds (MVOCs)
Fungi produce chemicals as a result of their metabolism. Some of these chemicals,
MVOCs, are responsible for the characteristic moldy, musty, or earthy smell of fungi,
whether mushrooms or molds. Some MVOCs are considered offensive or annoying.
Specific MVOCs are thought to be characteristic of wood rot and mold growth on
building materials. The human nose is very sensitive to mold odors and sometimes more
so than current analytical instruments.
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Molds are a group of organisms that belong to the Kingdom of Fungi (see Fungi). Even
though the terms mold and fungi had been commonly referred to interchangeably, all
molds are fungi, but not all fungi are molds.
Mycotoxins are compounds produced by some fungi that are toxic to humans or animals.
By convention, the term? Mycotoxin? Excludes mushroom toxins. Fungi that produce
mycotoxins are called "toxigenic fungi.
General Term for a reproductive structure in fungi, bacteria and some plants. In fungi, the
spore is the structure which may be used for dissemination and may be resistant to
adverse environmental conditions.
Toxic mold
The term? Toxic mold" has no scientific meaning since the mold itself is not toxic. The
metabolic byproducts of some molds may be toxic (see mycotoxin).
Hypha (plural, hyphae)
An individual fungal thread or filament of connected cells; the thread that represents the
individual parts of the fungal body.
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