MOLD DETECTION SA • ASPERGILLOSIS

Aspergillosis – Understanding Aspergillus and Indoor Mould Exposure

Aspergillosis is not caused by every exposure to Aspergillus. Most people inhale mould spores every day without becoming ill. Problems arise when susceptible individuals are exposed to significant indoor mould overabundance or when their immune system is unable to effectively defend against fungal exposure.

Aspergillus is one of the world’s most common mould genera and is found naturally outdoors in soil, vegetation, compost, dust and decaying organic matter. It is also frequently encountered indoors where excessive moisture, water damage or poor ventilation allow mould growth to develop. While most healthy individuals inhale Aspergillus spores every day without adverse effects, prolonged exposure to indoor mould overabundance may increase health risks for susceptible occupants.

Aspergillosis is the collective name given to several diseases caused by certain Aspergillus species. These range from allergic reactions affecting the nose, sinuses and lungs, to chronic lung infections and, in severely immunocompromised individuals, invasive fungal infections that require urgent specialist medical treatment. The type and severity of disease depend largely on the person’s underlying health, immune status and respiratory condition rather than exposure alone.

At Mold Detection SA, we believe it is important to place Aspergillus into its proper indoor environmental context. Water-damaged buildings rarely contain only one mould genus. Instead, they commonly contain multiple moisture-associated moulds growing together, including Cladosporium, Penicillium, Alternaria, Scedosporium, Mucorales, Fusarium, Epicoccum and many others. For this reason, professional mould investigations should never focus on Aspergillus alone but rather evaluate the complete indoor fungal ecology and determine whether microbial overabundance has developed within the building.

Important: Mold Detection SA does not diagnose or treat aspergillosis. Our role is to identify hidden mould growth, determine microbial overabundance, investigate moisture sources and assess indoor environmental conditions that may contribute to ongoing mould exposure. Medical diagnosis and treatment should always remain under the care of an appropriately qualified healthcare practitioner.

How Indoor Aspergillus Exposure Occurs

Many people mistakenly believe that exposure to Aspergillus simply means breathing in mould spores. Modern indoor environmental science has shown that occupants of damp, water-damaged buildings are exposed to a far more complex mixture of biological contaminants. As mould colonies grow, mature, dry out or become disturbed, they continuously release microscopic fungal particles into the indoor environment, many of which are invisible to the naked eye.

Aspergillus frequently develops inside ceiling voids, wall cavities, insulation, carpets, roof spaces, air-conditioning systems, cupboards and other concealed damp areas where it may remain undetected for months or even years. During this time, occupants may unknowingly inhale a continuous stream of fungal particles, even when no visible mould is present inside the living space.

The symptoms associated with indoor Aspergillus exposure vary considerably between individuals. Healthy occupants may experience no noticeable effects, while mould-sensitised individuals, allergy sufferers, asthmatics, people with chronic lung disease and immunocompromised occupants may develop respiratory irritation, allergic disease or, in rare cases, more serious Aspergillus-related infections. The severity of illness depends on both the individual’s medical condition and the extent of the indoor microbial burden.

It is equally important to recognise that Aspergillus is seldom the only mould present within a damp building. Professional investigations frequently identify multiple mould genera growing together, creating a combined microbial burden that may have a greater impact on indoor air quality than any single mould species alone. For this reason, Mold Detection SA evaluates the complete indoor fungal ecology, rather than concentrating exclusively on Aspergillus.

Professional Investigation and Remediation of Aspergillus Contamination

Finding Aspergillus inside a building should never be viewed in isolation. Its presence usually indicates an underlying moisture problem that has allowed fungal growth to develop. Simply cleaning the visible mould or applying household chemicals rarely addresses the hidden contamination or the conditions responsible for continued fungal growth. Successful remediation begins with identifying why the mould developed, where it is growing, and how extensive the contamination has become.

Professional mould inspections investigate the complete indoor environment, including hidden mould growth, moisture intrusion, building defects, fungal overabundance and indoor air quality. Because Aspergillus commonly grows together with other moisture-associated moulds, a professional assessment determines the overall microbial burden affecting the building rather than concentrating on one mould genus alone.