Ascaris lumbricoides
Diagnosis of "B. procyonis" is through identification of larvae in tissue examination. Diagnosis requires forehand knowledge along with understanding and recognition of larval morphologic characteristics, including ability to distinguish between a number of possible other parasites, including "Toxocara canis", "Toxocara cati", "Ascaris lumbricoides", and among species of "Gnathostoma", "Angiostrongylus", and "Ancylostoma". Distinguishing features of "B. procyonis" larvae in tissue are its relatively large size (60 μ) and prominent single lateral alae. Sometimes serologic testing is used as supportive evidence, although no commercial serologic test is currently available.