Hemagglutination-inhibition and serum neutralization response of horses to eastern equine encephalomyelitis virus.

The research focuses on the immune response of horses to the Eastern Equine Encephalomyelitis (EEE) virus, specifically how horses develop Hemagglutination-Inhibition (HI) and serum neutralizing antibodies.

Experimentation and Findings

• Four horses were injected with the EEE virus. None of them showed any symptoms of the disease, however, they all developed HI antibodies and serum neutralizing antibodies.
• The level of HI antibodies produced was high initially but decreased faster compared to the serum neutralizing antibodies. On the other hand, the neutralizing antibodies took some time to be detected in the horses’ blood but their levels remained steady for a longer time period.

Horse and Pony Observations

• A broader study was conducted involving 14 horses and ponies. All of them demonstrated significant levels of neutralizing antibody.
• The presence of HI antibodies varied among these animals ranging from 5 to 9, which depended on the number of units of antigen used in the tests.

Cases of EEE

• The study also analyzed sera from 3 clinical cases of EEE. All three were positive for HI antibodies.
• However, only one of these animals showed a significant level of neutralizing antibody, indicating a likely difference in individual immune responses.

The findings from this research are key to understanding the immunity mechanisms in horses against the EEE virus. It highlights the development and behavior of two different types of antibodies and their possible role in EEE resistance. More extensive research is needed to draw conclusive theories.