Which method is NOT used to test for Viral Neurotropic Disease (VND)?

The selected answer is correct because radiology is not a method typically used to test for Viral Neurotropic Disease (VND). Instead, testing for VND primarily relies on direct viral detection methods and serological assays that can identify viral components or the immune response to the virus.

Viral isolation via inoculated embryonate SPF eggs, hemagglutination activity testing, and ELISA are all standard methods employed in the diagnosis of viral infections, including those affecting the nervous system.

In viral isolation, embryonated eggs serve as a growth medium, allowing the virus to replicate, which can then be further analyzed. Hemagglutination testing detects viruses that agglutinate red blood cells, providing preliminary indications of viral presence and activity. The ELISA (Enzyme-Linked Immunosorbent Assay) method is widely used to detect specific viral antigens or antibodies in the serum, confirming exposure or infection.

Radiology, on the other hand, mainly provides images of anatomical structures and is not specific for identifying viral infections directly. It may be used to assess the effects of a viral infection (like encephalitis or other damage to the brain) but does not diagnose the viral pathogen itself.