In this survey, diagnoses were based primarily on histopathology plus clinical history. The recorded incidents did NOT include farms experiencing recurrences.
Pigs show chronic wasting, pale skin color, and enlarged lymph nodes.
They usually develop jaundice and a decreased growth rate. The proportion of weaners affected varies but the mortality in those that are affected is high. The gross lesions are characteristic. The carcase is emaciated and jaundiced. The spleen and lymph nodes throughout the body are very enlarged, the kidneys sometimes are swollen with white spots visible and the lungs are rubbery and mottled.