The relationship between meteorological features and equine grass sickness (dysautonomia)

Area of Science:

• Veterinary Science
• Equine Health
• Environmental Epidemiology

Background:

• Equine grass sickness (EGS) is a rare but often fatal idiopathic disease affecting horses.
• Previous research has explored various potential causes, including environmental factors and toxins.
• Understanding the aetiology of EGS is crucial for developing preventative strategies.

Purpose of the Study:

• To investigate the association between local weather patterns and outbreaks of equine grass sickness.
• To identify potential environmental triggers that may contribute to the occurrence of EGS.
• To evaluate the compatibility of observed weather patterns with existing hypotheses on EGS aetiology.

Main Methods:

• Retrospective analysis of 15 confirmed equine grass sickness outbreaks in eastern Scotland.
• Correlation of outbreak timing with meteorological data, including temperature, precipitation, and frost events.
• Comparison of weather conditions during outbreaks with historical local climate data.

Main Results:

• A significant trend toward cooler and drier weather conditions was observed preceding the majority of EGS outbreaks.
• Irregular ground frosts were frequently associated with the studied outbreaks.
• The identified weather patterns were consistent across multiple outbreak instances.

Conclusions:

• Cooler, drier weather coupled with ground frosts may represent a potential environmental risk factor for equine grass sickness.
• These findings support the ongoing investigation into environmental influences, including potential fungal involvement, in the aetiology of EGS.
• Further research is warranted to elucidate the specific mechanisms linking environmental conditions to disease pathogenesis.