NAVLE Nervous

Equine Rabies Suspect Study Guide

Rabies is a fatal, neurotropic viral disease caused by the rabies virus (RABV), a member of the genus Lyssavirus within the family Rhabdoviridae.

Overview and Clinical Importance

Rabies is a fatal, neurotropic viral disease caused by the rabies virus (RABV), a member of the genus Lyssavirus within the family Rhabdoviridae. This zoonotic disease affects all mammals and has the highest case fatality ratio of any infectious disease. Although equine rabies is relatively rare (accounting for less than 1% of all rabies cases in the United States), it represents a critical public health concern due to its invariable fatality and potential for human transmission.

The AAEP classifies rabies vaccination as a core vaccine for all equids. The hallmark challenge of equine rabies is its highly variable clinical presentation, with insidious onset being extremely common. Clinical signs can mimic numerous other neurologic conditions, making early recognition critical for both animal welfare and human safety.

High-YieldOn the NAVLE, remember that there is NO antemortem diagnostic test for rabies in horses. Any horse with unexplained neurologic signs should be considered a potential rabies suspect. The diagnosis can only be confirmed postmortem via direct fluorescent antibody (DFA) testing of brain tissue.
Species Geographic Distribution Significance
Raccoons Eastern United States Most common reservoir in eastern states
Skunks Central and South-central US Primary reservoir in Texas, Oklahoma
Bats Throughout continental US Leading cause of human rabies in US
Foxes Alaska, Arizona, Texas Regional significance

Etiology

Viral Characteristics

The rabies virus is a bullet-shaped, enveloped, single-stranded, negative-sense RNA virus. The virion measures approximately 180 nm in length and 75 nm in diameter. The viral genome encodes five structural proteins:

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