|Group:||Group IV ((+)ssRNA)|
Tremovirus, also known epidemic tremor, is a virus genus belonging to the Picornaviridae family. The genus has one species, Tremovirus A, which is also called Avian encephalomyelitis virus. The first avian picornavirus to have its genome sequenced, it causes epidemic tremor in chickens.
Tremovirus is of economic importance to chicken farmers because it causes a drop in egg production in laying hens, and neurological diseases in chicks less than three weeks old.
Symptoms and diagnosis
Neurological signs such as ataxia, tremor of the head and neck, drooping wings, weakness, paralysis, exercise intolerance and blindness are seen in chicks less than 3 weeks old. In laying hens the disease causes a temporary reduction in egg production.
Treatment and control
Currently, no treatment is available, but chicks that survive infection are immune. Control is achieved by vaccination of the flock. The vaccine can be administered via inoculation of the wing web, by drinking water or eyedrops, though eyedrop administration is much more effective. Mortality ranges from 25–60% and surviving animals are considered nonprofitable.
- Avian encephalomyelitis virus is a picornavirus and is most closely related to hepatitis A virus, Journal of General Virology, 1999 Mar;80 ( Pt 3):653–62, by Marvil P, Knowles NJ, Mockett AP, Britton P, Brown TD, Cavanagh D
- Avian encephalomyelitis virus at Picornaviridae.com (retrieved September 14, 2011
- The Picornavirus Avian Encephalomyelitis Virus Possesses a Hepatitis C Virus-Like Internal Ribosome, Journal of Virology, February 2008, p. 1993–2003, Vol. 82, No. 4, by Mehran Bakhshesh, Elisabetta Groppelli, Margaret M. Willcocks, Elizabeth Royall, Graham J. Belsham, and Lisa O. Roberts
- Avian Encephalomyelitis expert reviewed and published by WikiVet, accessed 10 October 2011.
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