A mouse model for testing the pathogenicity of equine herpes virus-1 strains.

The paper discusses a mouse model created for evaluating the pathogenicity of equine herpes virus-1 (EHV-1) strains, showing that the model’s predictive parameter—the safety index derived from mouse body weight post-infection—accurately correlates with EHV-1’s pathogenicity in horses.

Mouse Model Development

• The researchers established a mouse model intended to test the pathogenicity (ability to cause disease) of equine herpes virus-1 (EHV-1) strains.
• The purpose of this model is to provide a reliable alternative testing method, ideally enhancing understanding and prediction of the pathogenicity of EHV-1 strains.

Validation of Mouse Model

• The model was validated by testing it with known EHV-1 strains; these strains are already delineated based on their low or high pathogenicity in horses.
• The model’s effectiveness was determined by its ability to accurately represent the known pathogenicity of these strains, demonstrating its potential use as an assessment tool.

Determining the Best Predictive Parameter

• The researchers evaluated various parameters to identify which one could best predict EHV-1 pathogenicity within the mouse model.
• The ‘safety index’ was identified as the most reliable predictive parameter. This index was calculated using the body weight changes of the mice after being infected with the EHV-1 strains.

Correlation with EHV-1 Pathogenicity in Horses

• When the safety index was employed as the predictive parameter in the mouse model, the researchers found strong correlations with the pathogenicity of EHV-1 strains in horses.
• This suggests that the mouse model can accurately reflect and predict the strains’ pathogenicity levels when they infect horses.

Assessing Different EHV-1 Strains

• The model’s reliability and predictive power were further tested by distinguishing between two EHV-1 strains, both of which had supposedly homogenized genetic backgrounds.
• The differentiation between these strains signifies the model’s potential to provide detailed insights into the pathogenicity of diverse EHV-1 strains even when their genetic backgrounds appear identical.