The conidia (asexual spores) are hydrophobic and readily airborne with the capacity to germinate in a wide range of conditions. They are thermotolerant, and capable of growth in temperatures ranging from 12 °C to over 50 °C which has contributed to their success as wide ranging opportunistic pathogens in vertebrates ( Bhabhra and Askew, 2005). Aspergillosis is known to occur in all domesticated and in many wild animal species with birds being particularly susceptible to infection ( Tell, 2005). In humans, Aspergillus causes a range of disease including allergic bronchopulmonary disease (ABPV), aspergilloma and various forms of invasive aspergillosis ( Latgé, 1999).