Evaluation of outbreaks of disease attributable to eastern equine encephalitis virus in horses.

The research conducted aims at understanding the outbreaks of eastern equine encephalitis virus (EEEV) in horses in Michigan and identifying environmental patterns and weather conditions that could contribute to the disease. The findings can potentially aid in recognizing areas which pose a greater risk for EEEV outbreaks in horses and humans.

Methods and Approach

• The study employs a retrospective analysis of epidemiologic records to scrutinize the patterns of EEEV outbreaks in horses.
• Data was obtained from census reports and medical records from 1942 to 1991. This data consisted of information about the vectors, wild-bird reservoir hosts, and incidental hosts including both horses and humans who contracted EEEV.
• The researchers compared the patterns detected during the EEEV outbreaks in horses with associated environmental aspects like water drainage patterns, EEEV vectors, wild-bird reservoir hosts, and weather conditions.

Results and Findings

• The research deduced that Michigan possesses all elements required to sustain EEEV statewide. This means that the environmental and climatic conditions in Michigan are conducive to the existence and propagation of EEEV.
• There has been a recurring regional distribution of disease outbreaks attributable to EEEV in horses. This implies certain regions are more prone to these outbreaks due to recurring patterns.
• Specific environmental and weather conditions like unique water drainage patterns, certain mosquito species, and areas with higher than average precipitation are associated with EEEV disease outbreaks in horses. This suggests that these conditions could potentially contribute to the outbreaks.

Conclusion and Future Implication

• Analysing environmental patterns, weather conditions, and distributions of vectors and reservoir hosts can help identify areas in Michigan and other similar environments where horses and humans are at an increased risk for EEEV outbreaks.
• This research potentially provides a foundation for developing prevention strategies and mitigation plans against the EEEV outbreak both for equine and human populations in susceptible areas.