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What is Epizootic Hemorrhagic Disease/Bluetongue Virus?

Hemorrhagic disease is often observed in pronghorn caused by infection with either epizootic hemorrhagic disease virus (EHDV) or bluetongue virus (BTV). Hemorrhagic disease caused by EHDV/BTV in Wyoming and the Rocky Mountain west is seasonal, occurring in late summer to early fall (corresponding with the presence of arthropod vectors), and tends to occur in epizootics with high morbidity and mortalityin affected pronghorn populations (mortalities may be in the tens, hundreds, or thousands). Outbreaks of disease tend to occur at lower elevations (usually <7,000ft) and are observed at fairly predictable 4–7 year cycles, with smaller disease events and sometimes no detectable disease events in intervening years.

Bluetongue Information
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