What finding is indicative of an infection with Trichomonas in pigeons?

The presence of white caseous exudate is a classic indicator of Trichomonas infection, particularly in pigeons. Trichomonas gallinae, the causative agent, often leads to lesions in the oral cavity and esophagus, which can manifest as caseous (cheesy) necrotic lesions. These lesions result in the accumulation of white, crumbly exudate that is characteristic of the infection.

In pigeons, this condition is commonly referred to as "canker" and produces a distinct appearance that is helpful for diagnosis. The presence of this exudate differentiates trichomoniasis from other potential infections or conditions that pigeons might suffer from, allowing for targeted management and treatment.

Other choices involve symptoms that do not specifically correlate with Trichomonas infection in pigeons. Severe coughing and nasal discharge, for instance, are more indicative of respiratory infections, while diarrhea with blood can suggest viral or bacterial infections rather than protozoal ones. Recurrent ear infections are not typically associated with Trichomonas and suggest other underlying issues, such as a bacterial infection unrelated to the protozoan pathogen.