Which symptom is NOT associated with aspergillosis?

Aspergillosis is a fungal infection caused by Aspergillus species, affecting the respiratory system of birds. The symptoms commonly associated with this condition predominantly relate to respiratory distress and overall health decline. Difficulty breathing is a primary symptom as the infection leads to issues in the air sacs and lungs, significantly impacting the bird’s ability to breathe normally.

Extreme thirst can be a response from the bird's body as it tries to combat the infection or may indicate dehydration from illness. Low energy levels are also observed in birds suffering from aspergillosis due to the strain the disease puts on their overall health and vitality.

Red flecking in the mutes is not a typical symptom associated with aspergillosis. Instead, the mutes (droppings) generally reflect the bird’s diet and health status rather than specific fungal infections. It would likely indicate other health issues or dietary changes rather than being a direct symptom of aspergillosis. Thus, this symptom does not align with the respiratory and overall health concerns characteristic of the condition.