Aspergillosis refers to a fungal disease or infection caused by the fungi Aspergillus. Aspergillus may be a common flora which will be found in indoor and outside environments. the general public may be exposed to the spores each day while not being affected. Aspergillosis typically happens in folks with respiratory system diseases or weakened immune systems. The spectrum of health problems caused by aspergillus include allergies, respiratory infections, and infections in other systems or organs.