Aspergillus is one of the most common moulds found in the indoor
environment. It has been isolated from damp walls, wallpaper,
PVC/paper wall covering, gypsum board, floor, carpet and
mattress dust, upholstered-furniture dust, acrylic paint, UFFI,
leather, HVAC insulations, filters and fans, humidifier water,
leather, fabrics, bird droppings and potted plant soil, plastic
and decomposing wood. Aspergillus species are also opportunistic
pathogens. They infect humans and animals through inhalation of
airborne spores causing a group of diseases collectively known
as aspergilloses. Inhalation of spores may also result in
allergic reactions. The species mostly involved in these
diseases is Aspergillus fumigatus (accounting for over 90% of
the infections) followed by Aspergillusflavus. Chaetomium is a
fungal genus that includes approximately 80 different species.
The species that is reported to be growing in building interiors
and present in air samples is C. globosum. It often occurs from
the whetting of drywall b