Antigen detection by '''immunocytochemistry''' for intracytoplasmic viral inclusions containing labelled viral protein can also be performed as well as serology. A 4-fold rise in ELISA antibody in paired serum samples from several animals is indicative of the disease. | Antigen detection by '''immunocytochemistry''' for intracytoplasmic viral inclusions containing labelled viral protein can also be performed as well as serology. A 4-fold rise in ELISA antibody in paired serum samples from several animals is indicative of the disease. |