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Description
Viral diseases affecting the central nervous system (CNS) of horses causing encephalitis or meningoencephalitis. The following horse diseases are subject to the infectious Diseases of Horses Order 1987: west nile, EVE. The Order, which revoked and replaced earlier legislation, makes these diseases compulsorily notifiable: it gives an inspector powers to declare an infected place where disease is suspected; to carry out a veterinary inquiry, prohibits the movement of horses carcases and other things onto or off the premises and requires cleansing and disinfection. Council Directive 90/426 of 26 June 1990 makes the following horse diseases compulsorily notifiable to the EU: Equine Encephalomyelitis (of all types, including Japanese Encephalomyelitis and West Nile Fever
Aetiology
Infection with any of the following viruses can cause CNS disease in horses:
Family Bornaviridae, Genus Bornavirus
- Borna Disease Virus
Family Bunyaviridae, Genus Bunyamweravirus
- Cache Valley Virus
Family Bunyaviridae, Genus Orthobunyavirus
- California Encephalitis viruses
- Snowshoe Hare Virus
- Jamestown Canyon Virus
- Main Drain Virus
Family Flaviviridae, Genus Flavivirus
- Japanese Encephalitis Virus *
- West Nile Virus (WNV) *
- Kunjin virus
- Murray Valley Virus
- St. Louis Encephalitis Virus
- Powassan virus
Family Paramyxoviridae, Genus Henipavirus
- Nipah virus
Family Rhabdoviridae, Genus Lyssavirus
- Rabies Virus *
Family Reoviridae, Genus Orbivirus
- Equine Encephalosis Virus
Family Togaviridae, Genus Alphavirus
Other viruses implicated in equine encephalitis:
- Louping Ill Virus
- Maguari Virus
- Aura Virus
- Una Virus
- Highlands J Virus
- Semliki Forest Virus
- Getah Virus
References
Bertone, J.J (2010) Viral Encephalitis in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) Equine Internal Medicine (Third Edition), Saunders, Chapter 12.