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Fusarium

A water-loving mold that can grow at near-freezing temperatures, commonly found in water-damaged buildings.

Appearance

Fusarium colonies are typically pink, white, or reddish with a cottony or woolly texture. Some species produce a distinctive purple or violet pigment that diffuses into the surrounding material. Under a microscope, its spores are banana-shaped or canoe-shaped, which is a key identifying feature.

Where It's Found

Fusarium is commonly found in soil and on plants outdoors. Indoors, it thrives in water-damaged carpets, drywall, wallpaper, and around humidifiers and water sources. It is notable for its ability to grow at temperatures near freezing, making it a year-round concern in Michigan.

Health Effects

Fusarium can cause allergic reactions and respiratory symptoms. It produces several mycotoxins including trichothecenes and fumonisins. In immunocompromised individuals, it can cause serious disseminated infections (fusariosis) affecting the skin, eyes, and internal organs. It is also a common cause of eye infections (keratitis).

Relation to Water Damage

Fusarium requires high moisture levels to grow, making it a common finding in water-damaged buildings. It is frequently found in chronically wet carpets, saturated drywall, and around persistent plumbing leaks. Its presence strongly indicates that affected materials have remained wet for an extended period.

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