Aspergillus infections in birds are known to cause which type of lesion?

Aspergillus infections in birds primarily lead to the formation of necrotic or white nodules, which are characteristic lesions associated with this disease. Aspergillus species, especially Aspergillus fumigatus, can colonize various tissues and body cavities in birds, resulting in granulomatous inflammation. The body attempts to contain the infection, leading to the formation of these nodular lesions.

These nodules may appear white or creamy and often have necrotic areas due to the tissue destruction caused by the fungal invasion. In birds, such lesions can be observed in organs such as the lungs, air sacs, and other tissues, contributing to respiratory distress and other clinical signs.

In contrast, although hemorrhagic spots, cysts, and abscesses can be associated with other infections or conditions, they are not specifically indicative of Aspergillus infections in avian species. Hemorrhagic spots are more commonly observed in conditions associated with trauma or systemic diseases impacting hemostasis. Cysts are generally not a primary lesion associated with fungal infections like those caused by Aspergillus, and abscesses typically indicate a bacterial infection rather than a fungal one. Thus, the formation of necrotic or white nodules is a key