Comparative diagnostic value of the gel diffusion test and virus isolation in cell culture for detecting equine herpesvirus type 1 (EHV-1).

The research assesses the efficiency of the gel diffusion test versus virus isolation in cell culture for detecting equine herpesvirus type 1 (EHV-1), a virus that causes illness in horses. The gel diffusion test showed promising results in terms of speed and simplicity when tested on field samples from cases of equine abortion, foal mortality, and equine paralysis due to EHV-1.

Methodology

• The researchers started by applying the gel diffusion test directly to samples obtained from horses that had symptoms of diseases caused by the equine herpesvirus type 1. These conditions included foal mortality, equine paralysis, and abortion among mares.
• In order to concentrate the viral antigen, a substance that triggers the immune response, polyethylene glycol was used. Following the incubation of the sample for 24 hours at 25 degrees Celsius, a single line formed against EHV-1 antiserum, indicating a positive test result.

Comparison of Diagnostic Methods

• The researchers compared the results produced by the gel diffusion test to those generated by virus isolation in primary lamb kidney cell cultures. This comparison was conducted on 41 field samples.
• The results displayed a significant correlation between the two methods, indicating that both tests could diagnose the presence of equine herpesvirus type 1 effectively.

Advantages of the Gel Diffusion Test

• The gel diffusion test produced results rapidly, and the test itself was simple to perform. These attributes were seen as distinct advantages over the technique of isolating the virus in cell culture.
• Another advantage of the gel diffusion test was the endurance of its precipitating antigen, which retained its activity even after being heated to 56 degrees Celsius for 30 minutes. This property could scaffold its affordability via long-term storage.
• Interestingly, a sample that was contaminated but did not yield the virus in the cell culture system yielded a positive result on the gel diffusion test, suggesting this technique might be more sensitive or better at handling contaminated samples.