Their colour often depends on what they are growing on. The colour black, dark brown, white, red, bluish, orange cannot tell you what type of mould it is or if it is a toxic mould or not! Moulds can grow very rapidly or slowly. Based not on what kind of mould it is, but on available moisture, temperature, and kind of material it is growing on gives moulds unique the colours you see.TYPES OF MOULDA large number of moulds are able to produce a hypersensitive response in people, including allergic and asthmatic reactions, in sensitized people. In rare cases mould can cause disease, but this is unusual to find outside of hospitals.

As a home inspector in the Orillia, Gravenhurst, and Muskoka area I see and test for mould in homes cottages and commercial buildings regularly. Identifying the types of mould I leave to the lab, the only way to identify moulds correctly. Knowing what to recommend to my clients after the lab report returns, means I must understand the types of mould in the structure and their effects on both the structure and on the clients who may soon inhabit the home. In short there are three types that affect people, my most important consideration. The most common finding in Muskoka, Orillia, and Gravenhurst when I test for mould is allergenic moulds. Allergenic moulds cause allergic symptoms (Type I hypersensitivity) But they can also trigger asthma attacks in susceptible persons.

Modern medicine does not consider mould as a cause of the disease called asthma. Runny noses, nasal congestion, wheezing, sneezing, and itching, watery eyes, skin rash and itching (dermatitis), chest tightness and shortness of breath have all been attributed symptoms caused by mould . In my mould testing I have on one very rare occasion found Pathogenic mould present. Pathogenic moulds cause infectious diseases and can affect people with weakened immune systems, such as those who are immune-compromised or immune-suppressed from drug treatment. Such infections can affect the skin, eyes, lungs or other organs. These are considered opportunistic infections that usually do not affect healthy people.

Thankfully there are very few moulds that are pathogenic and in the case I found it, it was in an abandoned building with a heavy rodent infestation. Mycotoxic moulds are those that have a high content of fungal poisons (mycotoxins) and may cause severe symptoms. This is a controversial aspect of mould because little is known about fungal toxins and how inhaling them affects people. Evidence supports concluding mycotoxin exposure can cause mucous membrane irritation and respiratory inflammation, fatigue, headaches, mood swings, and even memory loss.

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