One of the most common outdoor molds, frequently found indoors in water-damaged environments.
Alternaria colonies are typically dark olive-green to brown or black with a velvety or woolly texture. Under a microscope, its spores are large, dark, and club-shaped with distinctive cross-walls (septations) that give them a segmented appearance.
Alternaria is one of the most common molds found both outdoors and indoors. Inside buildings, it thrives near windows and doors, in bathrooms, kitchens, and anywhere with persistent dampness. It commonly grows on drywall, wallpaper, textiles, and around window frames where condensation collects.
Alternaria is a major allergen and one of the leading causes of mold-related allergic reactions. Exposure can trigger hay fever symptoms, asthma attacks, and other respiratory issues. Prolonged exposure may contribute to the development of asthma in children. In rare cases involving immunocompromised individuals, it can cause skin and sinus infections.
Alternaria does not require as much moisture as some other indoor molds, but water damage significantly accelerates its growth. It is commonly found in homes that have experienced flooding, roof leaks, or plumbing failures. It can begin colonizing damp surfaces within 24-48 hours of water exposure.
If you suspect mold growth in your home or business, contact us for a professional assessment.
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